File:Aquatic life (1916-1917) (19126176413).jpg

Title: Aquatic life
Identifier: aquaticlife219161917baus (find matches)
Year: 1916-1917 (1910s)
Authors: Bausman, Joseph E
Subjects: Aquariums; Fish culture
Publisher: Philadelphia : J. E. Bausman
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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Text Appearing Before Image:
MTie Respiration of FisKes REV. J. G. WOOD
Text Appearing After Image:
Queen Lil M- Owned by Franklin Barrett Photo b^ Geo. H. Seip In the higher heings, the oxygen which is contained in the atmosphere is brought in contact with the blood in a very beau- tiful manner, and in the act of breathing a very difficult problem is solved. How is it possible to allow the atmos- phere to come in contact with the blood without permitting it to escape from the vessels through which it flows? This difficulty is surmounted in a very simple manner. A portion of the circu- lating apparatus is so contrived that the vessels are diminished to the minutest possible size; so small, indeed, that there is only just room for the globules of the blood to pass singly. The walls of the vessels are extremely thin and delicate, and are made of a substance which allows the passage of air while it retains the blood. In the larger vessels, such a structure would be impossible, on account of the pressure to which the walls are subjected by the volume of blood that rushes through them ; but in those parts which are exposed to the air, the cur- rents are so minute that they exercise comparatively little force, and are easily contained within their delicate walls. It is, of course, an important point that a very large surface should be ex-

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