Proceedings of the Royal Society of Edinburgh Volume 19 - Brossura

Edinburgh, Royal Society Of

Brossura

ISBN 10: 1130186970 ISBN 13: 9781130186970

Casa editrice: RareBooksClub.com, 2012

Riassunto

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 Excerpt: ...F.R.S. (Edin.), F.C.S., &c. (Read May 2, 1892.) I have already shown that the secretion of the five large cardiac sacs of the stomach of Uraster rubens contains uric acid; and consequently these sacs are considered to be the necessary apparatus for eliminating the nitrogenous products of the waste of the tissues, &c., from the blood or hydrolymph. It may be stated that Mr H. E. Durham f has raised the question that there is a possible source of error in concluding that these sacs have a renal function. He says that "it is possible that the uric acid arrived into the starfish's stomach in the interior of small mussels, fec., whose excretory organs contain that body, and of which as food the starfish appears to be very fond: anyhow, such a source of the uric acid must be eliminated before Griffiths' conclusion can be accepted; for obviously, if the presence of urates were demonstrated in the gastric contents of an individual who had recently supped off oysters, it would by no means follow that the stomach was the organ whereby the individual excreted his urates." Certainly not; but Mr Durham has overlooked the fact that if the uric acid had been introduced along with the food, I should also have found urea in the contents of the starfish's stomach; but I conclusively proved that urea was absent. Now, as a matter of fact, Mr Follows and myself have shown that urea (as well as uric acid) is present in the secretion of the organs of Bojanus in the Lamellibranchiata; and, therefore, if the starfishes had supped off oysters or mussels, I should have found urea, in addition to uric acid, in the contents of the stomach. But Proceedings of Roya! Society of London, vol. 44 (1888), p. 325. + Quarterly Journal of Microscopical Science, vol. 33 (1891). ...

Su questa edizione

• Editore: RareBooksClub.com
• Data di pubblicazione: 2012
• ISBN 10: 1130186970
• ISBN 13: 9781130186970
• Rilegatura: Copertina flessibile
• Numero di pagine: 110