xvi CONTENTS. 



II. GENITAL SYSTEM 477 



1. MALE GENERATIVE ORGANS 477 



Secretion of spermatic fluid, 478. Spermatozoids, 479. 

 Erection, 482. Erectile systems in general, 484. Ejacula- 

 tion. 485. Cowper's and Littre's glands, 485. Office of 

 the prostate, 486. 



2. FEMALE GENERATIVE ORGANS 488 



Ovary and Graadan vesicles, 488. Ovulation, 489. Yellow 

 body, or corpus luteum, 492. Menstruation, 493. Vagina, 

 494. 



III. FECUNDATION AND DEVELOPMENT OF THE FECUNDATED 



EGG 494 



1. Fecundation, 494. Caduca, or membrana, 497. Development 

 of the fecundated egg, 499. Envelopes of the embryo : 

 first chorion, 499 ; umbilical vesicle, 500 ; amnion, 500 ; 

 second chorion, 502; allanto'is, 503; third chorion, 505; 

 placenta, 506 ; respiration in the foetus, 607 ; nutrition of 

 the foetus, 507. Development of the body of the embryo, 

 608. Nervous system, 509. The circulations in the em- 

 bryo : first circulation, 510 ; second circulation, 512. Sum- 

 mary of the foetal circulation, 518. 



