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



the urine remained almost constant ; it rose somewhat on the ninth 

 day, when a little more urine than usual was passed of a higher specific 

 gravity. The average quantities are better discussed later on. 



The faeces for the first two days contained rather less nitrogen than 

 the next two, so that the percentage absorbed during the different 

 days varied from 89*75 per cent, to 94*31 per cent, of the total nitrogen, 

 as estimated by subtracting the quantity of nitrogen left in the faeces 

 from the quantity known to be given in the diet. The fat in the 

 diet was in this case 12 '04 grams, and the faeces contained during three 

 days from 0*710 to 0*773 gram, one day being unfortunately lost, so 

 that the percentage absorption of fat fluctuated from 94*54 to 94*10. 



(b) The diet on the twelfth day increased, so that the dog received 

 32*04 grams of fat, and charcoal was given on the fifteenth, and another 

 period of four days analysed. During the four days the urine 

 remained pretty well constant, being from 95 to 80 c.c. The nitrogen 

 on the fifteenth, sixteenth, and eighteenth days was almost the same, 

 3*754 grams, but the seventeenth day it fell somewhat to 3' 164 grams. 



The quantity of faeces varied from 17*52 to 24*56 grams, and the 

 nitrogen also varied, the daily quantity fluctuating between 0*351 and 

 0*497 gram, the fat showing again a greater fluctuation from 0*673 to 

 1*330 grams. 



Thus the percentage absorption of proteids varied between a range 

 of 89*68 and 92*71 per cent., while the fat varied between 95*85 and 

 97*90 per cent. 



On the 19th another 30 grams of fat was added to the diet, so that 

 the dog now received no less than 62*04 grams of fat per diem, as 

 well as the original quantity of proteids and carbohydrates. 



(c) On the 22nd the analyses were again begun, and carried on for 

 four days. The quantity of urine varies from 60 to 85 c.c. ; the specific 

 gravity shows the same fluctuation. 



The nitrogen in the urine had its lowest limit at 3*085 grams its 

 highest at 3*789 grams. The quantity of faeces varied from day to day 

 between 17*52 and 28*26 grams, and there was a very marked differ- 

 ence in the quantity of nitrogen eliminated in the faeces during the 

 eight days, being on one day as low as 0*364, while another day it 

 reached as high as 0*620 gram. 



The fat in the faeces varied from 0*876 to 1*644 grams per diem. 

 This different quantity of nitrogen and fat on the different days caused 

 the percentage of the nitrogen absorbed to vary from 87*13 to 92*44 

 per cent., while the percentage of fats varied from 97*35 to 98*59 

 per cent. 



Dog 2. In Table II, which gives the details of Experiment 2, there 

 were two separate periods in which the quantity of fat given remained 

 the same, the diet containing 8*00 grams of nitrogen and 15*20 grams 

 of fat. 



