210 MILK AND ITS HYGIENIC RELATIONS 



the proportion of one part of dried milk to four of water, and after 

 eight days in the proportion of one to six. The condensed milk 

 was prepared in the proportion of one part of milk to three of water. 

 The fresh milk was received at the laboratory less than two hours 

 after the afternoon milking. Each variety of milk was either kept 

 in a refrigerator or incubated until it was used the following 

 morning. Each group of rabbits was divided into two, two animals 

 of each group being fed on refrigerated milk, and two on milk 

 incubated at 22 C., a temperature which was afterwards raised 

 to 30 C. 



Delepine records that ' the refrigerated milk diet seemed to 

 agree with all the rabbits for about one month, after which the 

 animals generally began to lose weight, but on replacing 30 c.c. 

 of milk by 30 gms. of cabbage, they gradually regained the lost 

 weight.' In this connection it is interesting to compare the experi- 

 ments carried out upon young guinea-pigs in regard to raw and 

 boiled milk, where it was shown that a vegetable dietary is 

 a necessity for these animals. 



The conclusions reached by Delepine are summed up by him as 

 follows : ' On comparing the groups of weights, it is clear that the 

 animals fed on dried milk diluted seven times gained weight more 

 rapidly than those fed on condensed milk diluted four times, or on 

 undiluted normal milk. The superiority of dry milk over fresh 

 milk observed in this set of experiments may be purely accidental, 

 but with regard to the differences between dry milk and con- 

 densed milk the explanation is obvious, for even though the 

 condensed milk was diluted only four times the reconstituted 

 condensed milk was poorer in protein and fatty matter than 

 the reconstituted dry milk, this being due to the fact that more 

 than one-half of the solid constituents of condensed milk consists 

 of cane sugar/ 



All the rabbits did not survive to the end of the experiment. 

 One fed on condensed, one on fresh refrigerated milk, and all 

 the rabbits fed on incubated milk died before the end of the experi- 

 ment, with the exception of one rabbit fed on fresh incubated milk. 

 Two of these animals had suffered from acute gastro-enteritis, but 

 there was some evidence that the milk had not been the source of 

 the infection. The results obtained with the incubated milk are 

 of interest when compared with the results obtained by Vincent, 

 who used milk which had been heated and then incubated as a food 

 for kittens. 1 



The experiments on rats conducted by myself, and referred to on 

 p. 179. also showed the favourable results obtained with dried milk. 



Clinical Data on the Value of Dried Milk as a Food for Infants. 

 The value of dried milk as a food is of considerable importance 

 both clinically and economically. 



If good results can be obtained by the use of dried milk for 

 1 Seep. 182. 



