90 Spermatozoa. 



GENITAL OKGANS FEMALE. 

 UTERUS, FALLOPIAN TUBES, VAGINA. 



Can all be hardened in chromic acid mixture, and 

 should not be washed unless absolutely necessary. 



To examine the glands of the uterus it is better to 

 use an animal that has borne young. 



These organs may also be hardened whole in Muller's 

 fluid or bichromate of potash. The sections are best 

 stained in logwood. 



OVARY 



Is best hardened in chromic acid mixture and should 

 not be handled more than is absolutely necessary. The 

 whole organ may also be hardened in Muller's fluid. 



MAMMARY GLAND. 



Cut small pieces and place in chromic acid mixture, 

 when hardened stain with logwood. 



PLACENTA. 



The placenta of guinea-pig is the best for examina- 

 tion, and should be taken a little after half the period 

 of gestation has passed. It may be prepared in chro- 

 mic acid mixture or in spirit mixture. Vertical sections 

 should be cut as thin as possible, and stained with 

 logwood. 



SPEBMATOZOA. 



The living spermatozoa of Triton cristatus make a 

 most beautiful preparation and are readily procured. 



