116 



It consists simply of a strong 

 test tube of same diameter as 

 the neck of the bottle and a 

 short piece of rubber which fits 

 tightly on both, with a pinch 

 cock between. 



When the milk is filled in the 

 bottle, the rubber and tube is 

 adjusted and the bottle turned 

 upside down as shown in Fig. 

 119. 



A few hours' rest will allow 

 any possible dust or sediment 

 to settle in the test tube, the 

 pinch cock is closed, the bottle 

 raised and the test tube re- 

 moved. 



Fig. 119. 



MODIFIED OE HUMANIZED MILK. 



The composition of human milk varies from that of the 

 cow, and in these days but too often has to be substituted. 



" Koenig " gives the averages of 107 analyses of human 

 and 793 of cow's milk as being: 



The object of modifying the cow's milk is to bring it as 

 near as possible to the human milk. In most large cities 

 this is done in milk laboratories like Gordon Walker's, and 

 many are the systems for doing this work. 



Modified milk should always be "prescribed" by a physi- 

 cian, and this is not the place to go nearer into it; hence, I 

 only describe one system which seems to me the most practi- 

 cal, namely that of Prof. Gaertner (Germany). 



Cool the milk at once after milking it; test it for fat and di- 

 lute it with an equal volume of boiled water. Run the mixture 



