156 



PHYSIOLOGY 



The changes in the weight of the ovaries during lactation are 

 shown in chart 18. 



12.0 7.1 8.5 8.5 9.0 12.2 tt.O 



Chart 17 Giving in milligrams the weight of both ovaries at twelve periods 

 during gestation. The mean value for each period is indicated by a heavy 

 circle the individual values by a cross. Days entered below and the average 

 number of fetuses above. The mean ovulating weight of the ovaries is 49 mgm. 



The values which appear in these charts depend mainly on the 

 number and size of the corpora lutea. For a discussion of these 

 structures see Long and Evans ('22). 



