OF UEEA AND XJEINART WATEE. 
807 
Table XXXIII.— Showing the basal quantities of Urea of each of four Prisoners 
on days of very light and of Treadwheel Labour. 
I860. 
Xo. 858. 
No. 948. 
No. 1040. 
No. 1041. 
Basal. 
Treadwheel. 
Basal. 
Treadwheel. 
Basal. 
Treadwheel. 
Basal. 
Treadwheel, 
March 3. 
11-07 
10-27 
10-1 
12-7 
13-8 
14-7 
17-7 
15-9 
4. 
5. 
10-78 
16 
16 
17-4 
6. 
11-6 
10-83 
18-3 
17-2 
12 
16-3 
24 
14-8 
7. 
21-34 
14-6 
16-2 
8. 
12-6 
13 
14 
14-3 
13-6 
16-3 
14-8 
12-2 
9. 
11-9 
12-1 
17 
24-2 
10. 
15-0 
10-5 
15-1 
13-0 
19-5 
14-3 
11. 
12 . 
23-8 
12-6 
15 
22-5 
13. 
13-6 
11-5 
16 
15-4 
16-1 
14-8 
14. 
7-3 
9-1 
14 
25-8 
15. 
16-8 
14-4 
12-8 
11-3 
16-5 
23-3 
26-3 
13-1 
16. 
25 
11-6 
20-8 
41-3 
17. 
6-24 
13-03 
16-5 
14-6 
16-5 
24 
34 
18 
The Table shows that the quantities of urea evolved by No. 1041 were notably larger 
than those of the other prisoners. On the average of the three others the quantity 
evolved per hour during the treadwheel labour was ‘2 gr. less than that evolved at rest, 
viz. 14-4 grs. and 14-6 grs. per hour, but when the returns of No. 1041 are added, the 
defect with the treadwheel labour is no less than 2*4 grs. per hour. There was some 
diversity in the returns of each of the three cases ; so that in one the quantity of urea 
was the same under both conditions, in another it was 2 ‘5 grs. in excess with rest, and in 
the third there w^as 1’9 gr. in excess with labour. The numbers of times in which any 
excess was found with labour over rest in the three cases were 28, 33, and 71 per cent, 
in the order above given. The gi'eatest excess with labour was 7*5 grs., and the greatest 
defect with labour was 5‘3 grs. per hour, and both occurred in the same person. In one- 
third of all these exceptions the excess was less than 1 gr. per hour. Hence it is shown 
that Uolent exertion has no definite influence over the excretion of urea in the absence 
of food. 
The following Table contains the results of the daily average of urea, chloride of 
sodium, and water, in each of the cases during the whole period of inquiry, distinguishing 
the days of treadwLeel labour from those of comparative rest, and indicating the periods 
w'hen certain additional foods were administered (Plate XXXV.}. 
