UROGENITAL SYSTEM 



231 



Man 1 06 '3 males to 100 females 

 Cattle 1 



Pigs l- 1 10 100 

 Dogs j 



Females preponderate among horses and sheep to the 

 extent of 100 to 99. 



The natural and all-sufficient food of the new-born of every 

 species of mammal, from the human baby down to the young 

 of the ornithorhynchus (duck-bills), consists of the mother's 

 milk, which is supplied to them in variable amount over 

 periods differing according to the species. 



The human infant (according to Camerer) takes at the first 

 day about 10 grammes at each feed, at the fifth day about 51 

 grammes, from eighteenth to twenty-first days about 100 

 grammes, and from that time onwards about 534 grammes 

 during the twenty-four hours. 



A healthy child fed regularly on breast milk should increase 

 in weight in the first year to about 10,172 grammes, about 2f 

 times the weight at birth. 



The following table gives the composition of human milk 

 compared with that of other animals : l 



From this table it will be seen that the analysis of asses' 

 milk comes nearest to that of human milk, both as regards 

 water and solids generally, and as regards the particular solid 

 components. The milk of pigs and sheep are the richest in 

 solids. 



The larger the animal the less prolific is it found to be ; for 

 instance : 2 



1 Munk-Schultz, loc. cit., p. 271. 



2 Ellenberger, Physiologie, ii., p. 264. 



