. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 914 PHYSIOLOGY OF THE DOMESTIC ANIMALS. of the glands of the vas deferens, of Cowper's glands, of the prostate gland, and of the vesiculae seminales. It contains water, varying from 80 per cent, to 90 per cent, in different animals, serum-albumen, alkali albu- men, nuclein, lecithin, cholesterin, fats, salts, especially the phosphates of the alkaline earths, with sulphates, carbonates, and chlorides, and a peculiar odorous principle the nature of which is unknown. When examined with the microscope it is fo
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 914 PHYSIOLOGY OF THE DOMESTIC ANIMALS. of the glands of the vas deferens, of Cowper's glands, of the prostate gland, and of the vesiculae seminales. It contains water, varying from 80 per cent, to 90 per cent, in different animals, serum-albumen, alkali albu- men, nuclein, lecithin, cholesterin, fats, salts, especially the phosphates of the alkaline earths, with sulphates, carbonates, and chlorides, and a peculiar odorous principle the nature of which is unknown. When examined with the microscope it is found that the seminal fluid may be divided into a plasma and formed elements. The constit- uents already mentioned constitute the plasma of the semen and the formed elements are the so-called spermatozoa, and it is the latter which are the active elements of the secretion in the function of Fig. 415.—Spermatozoa. (Landois.) 1, human (X 600), the head seen from the side; 2, on edge ; Tc, head; m, middle piece; /, tail; c, ter- minal filament. 3, mouse, i, bothriocephalus latus. 5, deer. 6, mole. 7, green woodpecker. 8, black swan. 9, from a cross between a goldfinch (m) and canary (/). 10, cobitis. Each spermatozoon consists of a flattened or pear-shaped head, fol- lowed by a rod-shaped middle piece with a long, tail-like prolongation, or cilium. When examined shortly after extrusion from the testicle, the cilium is found to be in rapid vibration, and by this motion the entire spermatozoon is propelled forward at the rate of about half a millimeter in a second. The movement of the spermatozoon is identical with that of other forms of ciliated movement and is affected in the same way by the same reagents. At first the movements are active, and, under favor- able circumstances, they come to rest only after two or three days. The spermatozoa of different animals differ in shape and size, as is shown in. Please note that these images are extracted from scanned page i
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