286 Prof. V. Harley. Influence of Removal of Large Intestine and 



Table XIII. Dog 5. Total Eemoval of the Large Intestine, showing 

 the Influence of an Increasing Quantity of Fat in the Diet on the. 

 Quantity of the Faeces and the Water of the Faeces. 



various amounts of fat diet, a dog, after the total removal of the large- 

 intestine, excretes no less than from 75 to 84 grams of faeces, containing 

 from 57 to 67 c.c. of water ; and further, that whereas the percentages 

 of water in the faeces in a normal dog varies roughly between 60 and 

 70, in dogs without a large intestine it varies between 77 and 84 per 

 cent. 



In the case of partial removal of the large intestine, during the time- 

 in which there was constipation and a day was consequently missed in 

 the action of the bowels, the percentage of water fell to 50*96 ; but on 

 the other occasions, when the bowels were acting regularly, the per- 

 centage tended to be high, 72*46; in fact, comparing fairly with those 

 dogs in which the large intestine was removed. 



The interesting fact brought out by this experiment is that in the 

 normal dog the increase of fat, causing an increased quantity of faeces, 

 is accompanied by an increased elimination of water, and at the same 

 time by a decrease in the percentage of water eliminated, and that this 

 relative decrease is due to an increase of solids in the faeces. 



Fr. Miiller* had already shown that increasing the fat in the diet of 

 a dog fed on meat caused a decrease in the percentage of water con- 

 tained in the faeces. Thus a dog on 1500 grams of meat, with 30 

 grams of fat, passed faeces containing 69*6 per cent, of water ; but on 

 increasing the fat of the diet to 60 grams it fell to 64*9 per cent., and 

 still further with 250 grams to only 53'0 per cent. 



* Fr. Miiller, loc. tit., p. 360. 



