CONSTITUTION OF MILK. 



and that the richness of the milk differs considerably in different 

 individuals. It is found that in all cases the milk is sufficiently 

 rich in the cheesy principle, the constituent in which it fails 

 being the butter, which is the most important in respect to- 

 nutriment. 



The butter globules of woman's milk, though much greater in 

 quantity, as appears above, than those in the milk of inferior 

 animals, appear from the observations of Dr. Donne to be 

 smaller in magnitude. We have given in fig. 43, the appearance 



Fig. 43. THIN DISC OF WOMAN'S MIJ^K, THE 120TH OF AN INCH IN DIAMETER, MAGNIFIED* 



400 TIMES IN ITS LINEAR, AND 160000 TIMES IN ITS SUPERFICIAL DIMENSIONS. 



of a disc of ordinary woman's milk, magnified similarly to fig. 40. 

 The difference between the magnitude of the globules is apparent. 

 92. The analogy of milk to blood manifested in a manner so 

 striking by the microscope, was still farther investigated in a 

 series of highly interesting experiments made by Dr. Donne". . 



107 



