OF THE URATES IN THE URINE. 
251 
There is no great difference between animal and vegetable food ; and no proof was 
obtained of the influence of exercise on the excretion of uric acid. 
From the experiments on the total amount of uric acid excreted in twenty-four 
hours, it appears as though the deficiency one day was followed by an excess the fol- 
lowing day. 
The result of these experiments is, that there is no relation between the acidity of 
the urine and the amount of uric acid in it. The urine that was most acid contained 
least uric acid. That which contained most uric acid was not highly acid. 
All food causes an increase in the amount of uric acid in the urine, and there is no 
decided difference between vegetable and animal food, either as to the increase or 
diminution of the amount of uric acid in the urine. 
These experiments also show the variations of the acidity of the urine which the 
food produces. They were made four months previous to the experiments in the first 
part of this paper, which were made in October. Those here given were made in 
June. 
On the Deposit of Urates in the Urine. 
That the amount of urates in the urine is not the only cause of their deposit, the 
following experiments are sufficient to prove : — 
Water passed at 
h 
5 
m Spec, gr, 
5 p.M. 1024‘9 
Acidity and uric acid 
per 1000 grs. of urine, 
grain. 
18-53 measures 0-22 No deposit. 
Water passed at 
7 
35 1029-2 
15-54 
0*29 
Thickish from urates. 
Water passed at 
10 
5 1027-2 
alkaline 
0-33 
No deposit. 
Another day at 
5 
50 p.M. 1024*4 
21-47 
0-07 
No deposit. 
7 
55 1029-6 
15-57 
0-31 
Thickish from urates. 
10 
45 1029-8 
alkaline 
0-90 
No deposit. 
Another day at 
10 
p.M. 1030-6 
alkaline 
0-76 
No deposit. 
The same is well 
seen in (15.). 
at 
5 
10 p.m. 1028-3 
14-90 
0-52 
Thick from urates. 
11 
1031-1 
2-85 
0-87 
Clear. 
The influence of temperature is always shown in the precipitation of urates taking 
place on the cooling of the urine. The low temperature of the night frequently will 
cause a deposit which would not form during the day. 
The influence of the acidity of the urine on the deposit can always be shown by 
adding any acid to the urine passed soon after food. Two portions being taken, and 
the one being made more acid than the other, will show a difference in the time or 
degree of deposit. 
The influence of water in preventing a deposit is shown, by adding distilled water 
to urine which would give a precipitate. Evaporation under the air-pump takes away 
