813 
OF TIEEA A^P PEINABT WATER. 
in the nitrogen evolved in the faeces by the three cases, which when reckoned as urea 
amounted to 17‘33grs. There was no decrease in the quantity of urea on Sundays at 
this period by the third case, but, on the contrary, there was an increase of 52 grs. above 
the average of nli days. The- loss of nitrogen in the urine was thus found in the faeces. 
The case which was allowed 6|- oz. of extra bread per day had the largest amount of 
faeces on the average, and the largest increase of faeces on Sundays. The total average 
excretion of faeces was 73 per cent, greater than in myself, with an equal amount of food 
and much more exertion. 
The foregoing investigation has elicited the following facts. 
1. The prisoners emitted much more urea and faeces than occurs in health under 
ordinary circumstances. 
2. On Sundays the amount of urea was commonly lessened, but the nitrogen in the 
faeces was increased in the same proportion. The whole weight of faeces was increased. 
3. With treadwheel labour there was a small mcrease in the amount of urea and of 
urine evolved, whilst there was a small decrease in the evolution of chloride of sodium 
by the urine, the weight of the faeces, and the nitrogen contained in the faeces. On 
Saturdays, with treadwheel labour the diminution in the faeces and the contained nitrogen 
was considerable. 
4. With increase in the allowance of bread there was a considerable increase in the 
weight of the faeces, and particularly with rest. 
[The follo^^dng are the results of the experiments which were made upon four prisoners 
in Wakefield Prison in .June 1861, and torivhich reference has been made at pp. 749-761. 
I have aiTanged them in the order observed in reference to the experiments at Coldbath 
Fields Prison ; and, for further convenience of comparison, the pages at which the latter 
have been recorded in this paper are annexed to each subject of inquiry. The details 
of the results are given at length in Table XXXIX. 
5 R 2 
