conklin edwin g (54 risultati)

Pamphlet. Condizione: Very Good. Vol 67, No 711, pp. 289-297, Extracted from orig vol, begins with title page, Stapled & trimmed, thus is llike a pamphlet, last page in facsimile else VG.

Soft cover. Condizione: Very Good. pp205-222, bibliography. Removed from ANNUAL REPORT OF THE BOARD OF REGENTS OF THE SMITHSONIAN INSTITUTION FOR THE YEAR ENDING JUNE 30, 1934. VG. In plastic report covers. From the introduction: : "If one were searching for the most inclusive subject in modern scientific research, what other topic would touch so may fields as that of evolution? In the nonliving world it includes almost everything from the evolution of atoms to that of universes; in the living world practically everything from amoeba to man, from germ cells to developed organisms, from reflexes to reason, from savagery to civilization. Almost all the work of modern science and learning could be classified under some of these fields. The small part of this vast theme which I shall touch upon in this address concerns merely some of the recent work on the methods and causes of organic evolution.".

Pamphlet. Condizione: Very Good. Vol 63, No 684, pp. 5-36, Extracted from orig vol, begins with title page, trimmed & stapled, thus it is like a pamphlet, VG.

Pamphlet. Condizione: Very Good. Oct. 1903, pp. 667-675, Illus, Extracted from orig vol, begins with title page, trimmed & stapled, thus is like a pamphlet, VG.

Pamphlet. Condizione: Very Good. Vol 73, No 749, pp. 538-546, Illus, Extracted from orig vol, begins with title page, trimmed & stapled, thus is like a pamphlet, VG.

Pamphlet. Condizione: Very Good. Vol 51, Article 8, pp. 1281-1294, Extracted from orig vol, thus begins with title page, trimmed & stapled pamphlet, else VG.

PAP. Condizione: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condizione: New. New Book. Shipped from UK. Established seller since 2000.

HRD. Condizione: New. New Book. Shipped from UK. Established seller since 2000.

StapleBound. ERNST ABBE COPY, SIGNED BY BOTANIST IRVING W. BAILEY AND STAMPED HIS PROPERTY, IRVING WAS AN P;DER COLEAGUE OF ABBE FROM THE UNIVERSITY OF MINNESOTA (illustratore). Copyright Date: 1913 SM QUARTO, AUGUST 1913, PP.179-198, GOOD, SOME MARGINAL NOTATION AND UNDERLINING Offprint FROM THE POPULAR SCIENCE MONTHLY.

HRD. Condizione: New. New Book. Shipped from UK. Established seller since 2000.

Hardback. First edition 1915. Conklin was a zoologist/biologist. This book has b&w photos, references, glossary and an index. 533 Good. The covers and spine have light shelf wear and soiling. Two cover corners have bumping. First owner's name in ink inside. No dust wrapper.

Booklet - Unbound Pages. Condizione: Very Good. 6 pages, illustrated. An authentic standalone article, extracted from a larger volume. Not a reprint or reproduction, but an original work in its own right. Supplied without title page or cover. Size: 16 x 23 cms. Category: Harper's Monthly Magazine; Cosmo Books : 29 years on ABE, 47 years taking care of customers. A bookseller you can rely on.

Hardcover. Condizione: Good. 1st Edition. xiv, 533 pp; 96 figs. Original cloth. Top & bottom of spine rubbed. Corners of the covers a little bumped and rubbed. Good. First Edition.

Condizione: VG. Baltimore, MD 1917 first edition. Williams & Wilkins. royal octavo wraps. Conklin article pp. 101-104. VG no owner marks.

Paperback. Condizione: New. Print on Demand. Delving into the origin and development of the ascidian egg, this book offers a detailed examination of the cell lineage and organization of this fascinating organism. The author, a renowned scientist, meticulously describes the maturation and fertilization processes, highlighting the unique movements of the egg's protoplasm and the formation of the yellow crescent, a crucial landmark in its development. Through meticulous observations and a wealth of illustrations, the book traces the early development of the ascidian embryo, providing valuable insights into the fundamental principles of cell division and differentiation. The author's groundbreaking research challenges established theories and sheds new light on the complexities of egg organization and the origins of embryonic structures. This book is an essential resource for developmental biologists, embryologists, and anyone seeking a deeper understanding of the intricate processes that govern the formation of life. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

Hardcover. Condizione: Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDGood hardcover, no dust jacket. Second revised edition. 1916. Princeton University Press. Clean pages, lightly tanned. Pencil markings to front pastedown, endpapers. Fray to head and heel of spine, corner tips. Chestnut brown boards with gilt lettering. 8vo. 550 pages.

Condizione: VG. 1934. Article at pp. 137-158 in single issue of Proceedings of American Philosophical Society. VG plus.

Paperback. Condizione: New. Print on Demand. This book explores the fascinating phenomenon of head formation in the flatworm Planaria. Through a series of detailed experiments, the author demonstrates that the frequency of head formation in Planaria can be controlled by exposing the worms to specific concentrations of various anesthetics. The author's findings challenge the prevailing view that head formation is a purely genetic phenomenon. Instead, their research indicates that environmental factors, specifically the presence of certain chemicals, play a significant role in determining how often heads form in Planaria. This discovery opens up new avenues for understanding how organisms develop and how their form and function are shaped by their environment. The book provides a valuable resource for biologists and anyone interested in the intricate processes of regeneration and development. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

Paperback. Condizione: New. Print on Demand. This book presents an in-depth analysis of the relationship between cell size and nuclear size during various stages of normal development. Using a variety of species, the author examines the factors that influence cell division and growth, including the unequal distribution of yolk, experimental alterations, and the variations in size among different cell types. The author provides a detailed account of cell lineage, focusing on the early differentiations of the developing egg. By studying individual blastomeres throughout the cleavage period, the author explores the relationship between nuclear growth and the increase in chemical substances and processes during cleavage, offering insights into senescence, rejuvenescence, and the ratio of nucleus to plasma. This book contributes to our understanding of the fundamental principles governing the development and differentiation of cells, providing a valuable resource for researchers in developmental biology and cell biology. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

Paperback. Condizione: New. Print on Demand. This book delves into the pathological ova and twin pregnancies discovered by the author, providing groundbreaking insights into the origins of human monsters. Previous theories of maternal impressions or supernatural causes are dismissed in favor of faulty implantation as the primary cause of these monstrous aberrations. The author presents evidence from a wide range of vertebrates, including extensive data from pathological human embryos, to support the idea that all monsters are produced from normal ova due to external influences. This book uncovers the truth behind the origins of human monsters, challenging conventional wisdom and revealing the intricate mechanisms that shape embryonic development. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

SOFTCOVER. Condizione: Good. 1st Edition. Large octavo softcover; 950 pp. Clean throughout withb/w plates and figures.Edge wear with wrinkling to spine; 1 inch open tear to foot of spine exposing text block (though not impacting text block stability); first three signatures weakening; previous owner's stamp to front wrap. Good. Vol. 82, No. 5, June 29, 1940, Centenary Celebration: The Wilkes Exploring Expedition of the United States Navy 18381842 and Symposium on American Polar Exploration. Includes technical reports on the discovery of Wilkes Land in Antarctica, terrestrial magnetism, and animal life of the Antarctic, alongside historical accounts of expeditions led by Admiral Byrd, DeHaven, and Peary.

Paperback. Condizione: New. Print on Demand. This book delves into the early development of the pigeon's egg, with a particular focus on polyspermy, a process where multiple sperm cells enter the egg during fertilization. The author, drawing on a series of close observations and detailed illustrations, presents a comprehensive analysis of this phenomenon in the pigeon egg. They chronicle the distribution of nuclei during the first fourteen hours after fertilization, detailing the migration of supernumerary sperm nuclei into the periblast, a region surrounding the central area of primary cleavage. This detailed account provides valuable insights into the biological processes at play during the early stages of embryonic development in birds. The book also examines the disappearance of supernumerary nuclei around ten to twelve hours after fertilization, exploring the subsequent organization of the periblast with nuclei derived from the cleavage nucleus. The author compares the pigeon egg to other meroblastic vertebrate eggs, such as those of reptiles and selachians, highlighting the similarities in the organization and function of their periblasts. This comparative approach offers a broader understanding of the evolutionary relationships between different vertebrate species and the similarities in their early developmental processes. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

Pamphlet. Condizione: Collectible; Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. Reprinted from American Naturalist vol. LXVII, 1933. Previous name stamps of Karl Sax and E. M. East. Signed presentation copy, with compliments of the author.Offprint. Original wrappers*. Signed inscribed presentation.

Pamphlet. Condizione: Collectible; Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. Reprinted from The Scientific Monthly, Vol. XXXV. 1932. First separate edition. Offprint. Original wrappers. *. First edition.

Pamphlet. Condizione: Collectible; Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. Very good condition. First separate edition. Offprint. Original wrappers. Ownership signature of George F. Atkinson on front cover. Science. Biology.*.

Pamphlet. Condizione: Collectible; Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. Very good condition. First separate edition. Offprint. Original wrappers. Ownership signature of George T. Atkinson on front cover. With compliments of the author stamp on front cover. Science. Biology.*.

Pamphlet. Condizione: Collectible; Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. First edition. Offprint. Original wrappers.*.

Pamphlet. Condizione: Collectible; Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. First edition. Offprint. Original wrappers.*.

Pamphlet. Condizione: Collectible; Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. Reprinted from Science, N.S. Vol. XXXVII, 1913. Some tearing of delicate front page. First separate edition. Offprint. Original wrappers. *. First edition.