Class Book of Botany; Being an Introduction to the Study of the Vegetable Kingdom Volume 1 - Brossura

Balfour, John Hutton

Brossura

ISBN 10: 1155083687 ISBN 13: 9781155083681

Casa editrice: RareBooksClub.com, 2012

Riassunto

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 edition. Excerpt: ... + Y = Reddish-orange or orange-red. R + Y = Orange. 2 Y + R = Yellowish-orange or orange-yellow. Y = Yellow. 2 Y + B = Greenish-yellow or yellowish-green. Y + B = Green. 2 B + Y = Bluish-green or greenish-blue. Henslow then proceeds to point out the importance of constructing a chromatometer or measurer of colours, on such principles as to enable the botanist to have a uniform standard to appeal to. There seems to be no doubt that this might be accomplished with benefit to science. The range of colours in species might thus be correctly defined, and an accurate nomenclature established, which is a great desideratum. 796. We now proceed to consider the colours presented by flowers, and more especially the changes which they undergo by cultivation. These changes, although they appear to be endless, are really limited in their extent. In reference to their colours, flowers are divided by De Candolle into two series--1. Those having yellow for their type, and which are capable of passing into red and white, and never into blue. 2. Those having blue for their type, and capable of passing into red and white, but never into yellow. The first series is called Xanthic, the second Cyanic. The following is a tabular view of the two series, green being considered as an intermediate state of equilibrium between the two:--Red Orange-red Orange Yellow-orange Yellow Yellow-green Green. Colour of Leaves. Xanthic Series. De Candolle, Fliysiolngie Vegemle, ii, 906. See also, Schubler and Funk, UntciBudiungen ueber die Bluthcnfarben, Tubingen, 1825. Green, which is made up of blue and yellow, is the centre whence the two series diverge, and they meet again in red. It would appear that all flowers capable of changing colour, do so in general by rising or...

Dettagli dell?edizione

• Editore: RareBooksClub.com
• Data di pubblicazione: 2012
• ISBN 10: 1155083687
• ISBN 13: 9781155083681
• Rilegatura: Copertina flessibile
• Lingua: Inglese
• Numero di pagine: 456