I 7 8 



MILK AND ITS HYGIENIC RELATIONS 



out that the results are in favour of the boiled milk. The mortality 

 rate can be further gauged by comparing the number of animals 

 used with those which died. 



Schroeder points out that the favourable results obtained with 

 the boiled milk were obtained with milk of a superlative quality. 

 Those animals which died, died mainly from inflammation of the 

 stomach and bowels, and of pneumonia. In some cases no lesions 

 were discovered to account satisfactorily for death. The average 

 weight of the guinea-pigs at different ages is also given and is here 

 appended : 



Average Weight in Grammes of Guinea-pigs at different Ages 



Here again in the artificially-fed groups the more favourable 

 results were obtained with boiled milk. 



Experiments on Mice. In 1904 Keller published some experi- 

 ments on mice. Like those of Bartenstein on guinea-pigs, they 

 were carried out as a result of Bolle's work, and were conducted 

 by him personally or under his immediate supervision 



The mice were fed upon raw milk, upon milk just boiled, and 

 upon milk which had been boiled for two hours. He found no 



