Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Vascular system of the lobster. studied in transparent aquatic larva, as those of theephemera, in which it forms a beautiful spectacle for themicroscopist. The chyle globules enter the dorsal vessel by 206 OF THE BLOOD AKD CIECULATIOIST. lateral slits, which are protected by valves. The simplicityof the circulating organs in insects forms a striking contrast. Fig. 223.—Circulation of insects. to the preceding classes; but we shall see, wh
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Vascular system of the lobster. studied in transparent aquatic larva, as those of theephemera, in which it forms a beautiful spectacle for themicroscopist. The chyle globules enter the dorsal vessel by 206 OF THE BLOOD AKD CIECULATIOIST. lateral slits, which are protected by valves. The simplicityof the circulating organs in insects forms a striking contrast. Fig. 223.—Circulation of insects. to the preceding classes; but we shall see, when treating ofthe function of respiration, that in insects the air is so com-pletely conveyed to all parts of their bodies, that a simplearrangement suffices for the perfect eeration of their blood. [§371. We have seen that the arteries terminate in the veinsin the periphery of all the organs ; these two divisions of thevascular system are connected by the capillary vessels. A viewof these vessels can only be obtained by successful minuteinjections, and the aid of the microscope ; size injections ofthe skin, and the mucous membranes of the lungs andintestinal canal, exhibit the peripheral capillary system ingreat variety. The web of the frogs foot, the fishestail, andthe branchiae of the tadpoles* of frogs, salamanders, shewthe splendid spectacle of the vascular system in action.—T. W.] [§ 372. However different the more minute capillary reticu-lations in the various organs appear, they may neve
Size: 2031px × 1230px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
