16 



pears as a process or offshoot of the crista urethralis of the Tri- 

 gonium Vesicae. At the summit, and at the bottom of the two 

 slits, open laterally the ducts of the vesicles, and medially the 

 ductus deferens .... From the caudal slope of the colliculus 

 go two distinct mucous membrane folds which run through the 

 entire pelvic urethra, near together, somewhat diverging, and then 

 coming together, so that they form an elongated, narrow oval. At 

 their caudal union, the excretory ducts of the bulbo-urethral 

 glands open side by side. At the point of departure of the folds 

 from the colliculus, arises a niche-shaped opening, between both 

 folds, and likewise lateral to each fold. In these niches open the 

 ducts of the prostate. The openings of the disseminate prostate 

 lie in rows as in the horse, but form not less than six rows. There 

 is one row medial to each fold, and two lateral. Midler mentions 

 only the medial rows. These rows extend to the opening of the 

 ducts of Cowper's glands. The stratum glandulare (disseminate 

 prostate) is very easy to recognize with the naked eye." 



Semen : The semen is the mixed product of the testicles, their 

 excretory passages, and the accessory sexual glands, a fact which 

 complicates its study considerably. The freshly ejaculated fluid is 

 cloudy, tenacious, more or less coagulable, and is rich in albumen. 

 It is weakly alkaline in reaction, and contains eighty to ninety 

 per cent of water. Of the solid constituents, there is forty per 

 cent of ash, of which three-fourths is calcium phosphate. Besides 

 the spermatozoa, the semen frequently contains epithelial cells, 

 leucocytes, concentric amyloid concretions, and lecithin bodies. 

 When' cold, the characteristic phosphoric acid salts are precipi- 

 tated. The fluid content is the product of the tubules of the 

 testicles, their excretory ducts, and the accessory sexual glands. 

 The characteristic odor "of the semen is supplied by a slimy nucleo- 

 albumen "spermin" which forms the spermatic crystals, and is 

 furnished by the prostatic secretion. 



During ejaculation the spermatozoa and secretions added by the 

 testicle and epididymis are probably carried to the ampulla by 

 peristaltic muscular action, in the earlier stages of the orgasm. 

 At the height of the orgasm, the ampulla is emptied into the pos- 

 terior urethra in common with the secretion of the contracting 

 vesicles, here to be admixed with the thin prostatic secretion. The 

 entire mixture is then propelled, and ejaculation produced by 

 strong muscular contractions of the entire urethra. As was stated 

 before, the semen is the product of the testicles, the excretory 

 ducts, and the accessory sexual glands. The testes furnish the 

 essential germinal elements, the sperms, and some of the fluid con- 

 tent. Then is added the product of the epididymis, vas, and 

 ampulla, which stimulates the spermatozoa to active motility, 

 nourishes the organisms, and adds somewhat to the fluid bulk of 

 the secretion. 



Stigler (25) states: "During its sojourn in the epididymis, the 

 properties of the spermatozoa are modified; the r.^vtility, ability 



