J. Alan Murray 



107 



inference, however, must be to a large extent discounted in view of the 

 magnitude of the probable errors. It could not have been deduced from 

 Swanson'.s data alone and until confirmed liy further evidence it must 

 be regarded as hypothetical. 



Table III. Influence of Age (Pigs). 



(.'(imposition of non-tatty matter 



The test of comparison with Lawes and tiilbcrt"s data is not con- 

 clusive, but, so far as it goes, it indicates that the inference is perhaps 

 more reliable than might be supposed. For this purpose the percentage 

 of water in the non-fatty matter was calculated, as before, by the 

 formula w = 90y;r'°^*"^; but owing to the difference in the ratio of 

 protein to ash different coefficients must be used for these ingredients, 

 thus 



P = 0-83 (100 -^W);A= 0-l('i (100 - W). 



The results are as follows: 



Store pig 



Fat pig 



In the following table the data are grouped according to the kind of 

 food consumed by the animals. 



Table IV. Influence of Food (Pigs). 



In order to interpret these results correctly it is necessary to make 

 allowance for the difference in size, i.e. to compare them with data 



