CONTENTS. xix 







PAGE 



941. The formation of the spermatozoa 1504 



942. The movements of the spermatozoa 1506 



943. The chemical constituents of semen 1507 



944. The lymphatics of the testis 1507 



Accessory Organs. 



945. The vesiculae seminales and prostate 1507 



946. Erectile tissue 1508 



947. The nature of erection 1509 



948. The emission of semen 1510 



CHAPTER II. 



PREGNANCY AND BIRTH. 



\ 



SECTION I. 

 THE PLACENTA. . 



949. The spermatozoon enters and unites with the ovum . . . 1512 



950. The formation of the decidua 1512 



951. The decidua serotina is transformed into the placenta . . . 1514 



952. The structure of the placenta 1515 



953. The nature of the vascular events taking place in the placenta . 1516 



954. The shedding of the placenta 1517 



SECTION II. 

 THE NUTRITION OF THE EMBRYO. 



955. The Embryo breathes by and feeds upon the maternal blood of the 



placenta 1520 



956. The blood and blood-flow in the umbilical arteries and umbilical 



vein 1521 



957. The amniotic fluid, its nature and origin, its relations to the nutrition 



of the foetus 1523 



958. The transmission of food material from the mother to the foetus . 1524 



959. Glycogen in the foetus 1526 



960. The movements of the foetus 1526 



961. The digestive functions of the foetus 1527 



962. The fcetal circulation towards the close of uterine life . . . 1528 



963. The cause of the first breath 1530 



964. The changes in the circulation taking place at birth . . . 1531 



