Download Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts
Download Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts
Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts.cLouis Agassiz
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Author: Louis Agassiz
Page Count: 96 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130325447
File size: 31 Mb
Download Link: Contributions to the Natural History of the United States of America Volume 2; First Monograph In Three Parts
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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. 1857 Excerpt: ...vena terminalis, into which they empty. On each side of the head the vena terminalis converges and joins the forked vessel, (PI. 18a, fig. 13, i, ', ) which is connected with the posterior end, the auricle, of the heart. Thus we have a perfect circuit in the circulation of the blood. At the outset, the heart, the first part of the vascular system in which a fluid may be seen in motion, sends the blood forward, through the arteries of the branchial fissures, to the dorsal artery; the dorsal artery sends off currents into the area vasculosa; these currents, the omphalo-meseraic arteries, empty into the vena terminalis; and the vena terminalis returns the blood to the heart, through the forked vessel, the vena afferens. There are also, within the body, circuits of blood of lesser extent than that already described. The dorsal artery, which rims along the middle line of the body, (PI. 18, fig. 7, ) forks as it reaches its posterior termination. Each limb of the fork doubles outwardly upon itself in a horizontal plane, and then passes forward parallel to, and in the same layer with, the dorsal artery, forming thus an abdominal vein, till it reaches the vena afferens, into which it empties, at a point a little posterior to the heart. That part of the dorsal artery which runs forward and forms a cephalic artery (PL 18a, fig. 11, /) branches and anastomoses extensively with return currents, the cephalic veins. These veins empty into the vena afferens, near the point where the abdominal veins discharge their contents into the heart. At the middle third of the body, the substance of the subsidiary layer is very much thickened around and above each abdominal vein, the thickening being shaped into a semicylindrical band, with the convex side downwards. Each thick band li.
Read online Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts Buy and read online Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts Download Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts
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Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts.cLouis Agassiz
Author: Louis Agassiz
Page Count: 96 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130325447
File size: 31 Mb
Download Link: Contributions to the Natural History of the United States of America Volume 2; First Monograph In Three Parts
---------------------------------------------------------------
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. 1857 Excerpt: ...vena terminalis, into which they empty. On each side of the head the vena terminalis converges and joins the forked vessel, (PI. 18a, fig. 13, i, ', ) which is connected with the posterior end, the auricle, of the heart. Thus we have a perfect circuit in the circulation of the blood. At the outset, the heart, the first part of the vascular system in which a fluid may be seen in motion, sends the blood forward, through the arteries of the branchial fissures, to the dorsal artery; the dorsal artery sends off currents into the area vasculosa; these currents, the omphalo-meseraic arteries, empty into the vena terminalis; and the vena terminalis returns the blood to the heart, through the forked vessel, the vena afferens. There are also, within the body, circuits of blood of lesser extent than that already described. The dorsal artery, which rims along the middle line of the body, (PI. 18, fig. 7, ) forks as it reaches its posterior termination. Each limb of the fork doubles outwardly upon itself in a horizontal plane, and then passes forward parallel to, and in the same layer with, the dorsal artery, forming thus an abdominal vein, till it reaches the vena afferens, into which it empties, at a point a little posterior to the heart. That part of the dorsal artery which runs forward and forms a cephalic artery (PL 18a, fig. 11, /) branches and anastomoses extensively with return currents, the cephalic veins. These veins empty into the vena afferens, near the point where the abdominal veins discharge their contents into the heart. At the middle third of the body, the substance of the subsidiary layer is very much thickened around and above each abdominal vein, the thickening being shaped into a semicylindrical band, with the convex side downwards. Each thick band li.
Read online Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts Buy and read online Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts Download Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Contributions to the Natural History of the United States of America Volume 2; First Monograph : In Three Parts
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