820 
DE. SMITH ON THE ELIMINATION 
Hence in every instance, and at all periods of the year, when food of an unusual kind 
and in unusual quantity was taken and retained, an increase in the elimination of urea 
immediately followed, and continued during periods varying from one to four days. In 
reference to the influence of wine, I have remarked that on the occasion on which the 
Avine Avas not good, and any stomach derangement followed, there Avas a much larger 
emission of iwea than occurred Avith a greater quantity of wine of fine quality. 
[Milk supper Avas also folloAved by an increased elimination of urea on May 18, July 
11 and 21, September 23 ; and the same result folloAved the eating of crab and cow-heel 
on May 13 and December 1, but the efiect was not uniform.] 
The infiiience of some special lands of food. 
As many of the experiments in reference to the action of foods did not extend beyond 
a part of a day, they cannot shoAV any influence OA’er the daily excretion of urea, and I 
shall not here refer to them. 
On the occasion on AA'hich I lived on bread Avith water, tea, and coflee during three 
davs, the total amount of urea, the quantities of urea and urinary water, Avere as fol- 
loAvs : — 
Table XLI. 
34 oz. 
48 oz. 
broad, 
water. 
34 oz. bread, 
48 oz. water, 
3.50 grs. tea. 
34 oz. bread, 
48 oz. water, 
2 oz. coflee. 
Urea. 
Urine. 
Urea. 
Urine. 
Urea. 
Urine. 
grs. 
fl. oz. 
grs. 
fl. oz. 
grs. 
fl. oz. 
442 
67-80 
467-28 
41-55 
493-16 
52-04 
The amounts eA’oh’ed on the preceding day Avere 650 grs. of urea and 57'73 oz. ot 
urine ; but as that Avas Sunday, there Avould have been, Avith ordinary food, a consider- 
able decrease on the Monday, and hence we lack a good basis for comparison. There 
can be no doubt, hoAvever, that there Avas a considerable diminution of urea on the day 
on which bread and Avater alone Avere taken ; but there Avas a progressive increase on the 
two following days, AA^hen tea and coflee Avere administered. On the following day, when 
bread and water only were taken until 2^ p.m., and then plenty of additional food, the 
urea increased to 507 '2 grs. 
The diminution in the excretion of urine with the tea was in part the result of the large 
elimination on the preceding day. The quantity evolved Avith the coflee was normal. 
The appetite was lessened under the influence of coflee, and there was an odour of 
coflee in the urine. 
If we accept Haughton’s analysis of bread, and consider that 1 oz. of fine bread is 
equivalent to 12-25 grs. of urea, we find that on the first day there were 25 grs. of urea 
eliminated by the urine more than could have been contained in the bread. 
On the occasion when extra foods were given to the prisoners, the following were the 
aA'erage results obtained : — 
