Increasing Quantities of Fat in Diet on Metabolism in Dogs. 277 



out of account, the quantity of urine collected on the other three days 

 was 310, 190, and 240 c.c. respectively, with a specific gravity varying 

 from 1018 to 1023. The nitrogen observed remained throughout the 

 period very constant, varying from 3'220 to 3'960 grams. The quantity 

 of faeces again here, as in the preceding period, was fairly equal in amount, 

 the quantity varying from 81'53 to 85- 10 grams. The quantity of 

 nitrogen in the faeces during these four days varied from 0'918 to 

 1*214 grams ; the smallest quantity was found on the day on which 

 the largest quantity of faeces was passed, that is to say, on the 

 thirty-first day. The fat was only analysed on three out of the four 

 days. 



Before discussing the average results of these four periods of analysis 

 it would be well to discuss the facts of the next experiment, in which 

 the large intestine was also entirely removed, so that the two averages 

 may be compared together. 



In this dog only two periods were investigated, to try to fill up the 

 gap in the observations just described, which were incomplete owing 

 to the impossibility of increasing the fat in the dietary in sufficient 

 degree. 



Dog 5. The first diet was started ten days before the analysis was 

 commenced. During the first period of five days the animal received 

 6'26 grams of nitrogen in his diet, and 11 '55 grams of fat. The 

 quantity of urine during these five days varied from 75 to 120 c.c., 

 the specific gravity varying from 1028 to 1052, the nitrogen, however, 

 remaining pretty constant throughout, only varying from 4' 110 to 

 4'508 grams. The quantity of faeces steadily increased in amount 

 during the five days, rising from 46'93 to 94'20 grams, the nitrogen 

 thereof also rising as the faeces increased, although it rose still more on 

 the fourteenth day, when the faeces were not quite so high as on the 

 thirteenth; it varied from 1'194 to 0'796 gram. 



The quantity of fat was only analysed on four of these days, and 

 varied from 0*380 to 0'618 gram. 



During the next period of four days the fat in the diet was increased 

 to 41 '55 grams; however, during the last two days (twenty-fifth and 

 twenty-sixth) the animal lost his appetite, although from the fifteenth 

 to the twenty-fifth he had steadily kept up his diet and gone up in 

 weight, and even stopping the fat for an interval and trying to admin- 

 ister it again was unsuccessful. Consequently, although the four days 

 were analysed, only the first two days can be taken as an average on 

 this diet. 



"We see on looking at the table that the quantity of faeces daily 

 passed varied very considerably, and therefore the results obtained 

 during the four days cannot be considered definite, but I have included 

 the facts as an addition to the preceding observations. 



On the increased fat diet it will be seen that the quantity of urine 



