PART I 

 Tne Period or Preparation 



The events which precede the initiation of the new individual's development are: 



(1) The preparation of the male and female parents and their reproductive structures 

 for the act of reproduction (Chaps. 1 and 2). 



(2) The preparation of the gametes (Chap. 3). 



The anterior lobe of the pituitary gland, because of its secretion of the gonadotrophic 

 (gonad-stimulating) hormones, is the pivotal structure in the reproductive mechanism. 

 The gonadotrophic hormones are: 



(1) Follicle-stimulating hormone, FSH; 



(2) Luteinizing hormone, LH (ICSH), and 



(3) Luteotrophin, LTH. 



