158 



PHYSIOLOGY 



Sex organs: (a) Male. See References. 



(b) Female. The placenta is not permeable for adrenalin 

 (Shimidzu '20) but is permeable for all basic dyes tested by 

 Shimidzu ('22) while among fifteen acid dyes eight penetrated 

 the placenta. Permeability is determined by the colloidal state 

 of the dye in the serum. 



During the several stages of oestrus and during all the phases 

 of the reproductive cycle, the female reproductive organs all 

 show concomitant modifications. 



The contractions of the longitudinal muscles of the uterus, 

 in relation to the phases of the oestrus cycle, have been studied 

 by Blair ('23) using the method of Kehrer ('07). The mean 



TABLE 114 



Mean contraction rates of uterus 

 D = dioestrous interval. O = oestrous 



contraction rate for the maximal contractions was slower during 

 oestrus than during the dioestrus. The rate for the submaximal 

 contractions varied widely, but the mean rate was little affected 

 by the phases of the cycle. The average values for six groups of 

 tests are given in table 114. 



11. Exocrine system. General. 



(a) Mammary function. See References. 

 (6) Feeding exocrine glands. See References. 



12. Endocrine glands. 



(a) General. See References. 

 (6) Testes. See References. 



(c) Ovaries. See References. 



(d) Suprarenals. The possible change in the weight of the 

 suprarenals during pregnancy and lactation has been examined 

 by J. C. Donaldson ('24). The results are given in table 115. 



