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CHAPTER XII.
ORGANS OF GENERATION.
(a) Male Generative Secretions.
The testes have been little investigated chemically. In the testes of
animals we find protein bodies of different kinds
—
seralbumin, alkali
albuminate (?), and an albuminous body related to Rovida’s hyaline
substance; also leucine, tyrosine, creatine, purine bases, cholesterin, lecithin,
inosite, and fat. In regard to the occurrence of glycogen the reports are
conflicting. Dareste 1
found, in the testes of birds, starch-like granules,
which were colored blue with difficulty by iodine.
In the autolysis of the testes Levene 2
found tyrosine, alanine, leucine,,
aminovaleric acid, aminobutyric acid, a-proline, phenylalanine, aspartic acid,
glutamic acid, and hypoxanthine. Pyrimidine and hexone bases could not be
detected.
• The semen as ejected is a white or whitish-yellow, viscous, sticky
fluid of a milky appearance, with whitish, non-transparent lumps. The
milky appearance is due to spermatozoa. Semen is heavier than water,
contains proteins, has a neutral or faintly alkaline reaction and a peculiar
specific odor. Soon after ejection semen becomes gelatinous, as if it
were coagulated, but afterward becomes more fluid. When diluted
with water white flakes or shreds separate (Henle’s fibrin). According
to the analyses of Slowtzoff 3 human semen contains on an average
96.8 p. m. solids with 9 p. m. inorganic and 87.8 p. m. organic substance.
The amount of protein substances was, on an average, 22.6 p. m. and 1.69
p. m. of bodies soluble in ether. The protein substances consist of nucleo-
proteins, traces of mucin, albumin, and a substance similar to proteose
f found earlier by Posner). According to Cavazzani semen contains
relatively considerable nucleon, more than any organ, v. Hoffmann 4
1
Compt. Rend., 74.
2
Amer. Journ. of Physiol., 11.
J
Zeitschr. f. physiol. Chem., 35.
* Posner, Berl. klin. Wochenschr., 1888, No. 21, and Centralbl. f. d. med. Wissensch.,
1890; Cavazzani, Biochem. Centralbl., 1, 502, and Centralbl. f. Physiol., 19; v. Hoff-
mann, cited in Bioch. Centralbl., 9, 206.
620
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