784 
DE. SMITH ON THE ELIMINATION 
Table XIV. — Showing the Hourly Eate of Elimination of Urea and Urinary Water 
at each quarter of ah hour. 
1S60. 
A.M. 
P.M, 
11 
lu 
m 
12 
m 
12f 
1 
2 
24 
3 
3i 
34 
December 17. 
LTrea 
Water 
grs. 
29-6 
il.oz. 
7-7 
gi-s. 
24-8 
fl.oz. 
7-37 
grs. 
27-1 
fl.oz. 
8.34 
grs. 
26-6 
fl.oz. 
8-2 
grs. 
27-8 
fl.oz. 
9-6 
gl-s. 
35-2 
fl.oz. 
12-8 
grs. 
33'6 
fl.oz. 
11-6 
grs. 
36 
fl. oz. 
12 
grs. 
40 
fl.oz. 
9-9 
grs. 
54-6 
fl.oz. 
13-5 
grs. 
26 
fl.oz. 
6-5 
grs. 
24 
fl.oz. 
4‘6 
grs. 
24 
fl. oz. 
6 
grs. 
25 
fl.oz. 
4-6 
December 18. 
L^rea 
Water 
grs. 
23-7 
fl. oz. 
4-4 
grs. 
22 
fl.oz. 
3-8 
grs. 
251 
fl.oz. 
4-5 
grs. 
20-8 
fl.oz. 
4-2 
grs. 
20-5 
fl. oz 
312 
grs. 
24-2 
fl.oz. 
3-37 
grs. 
22-8 
fl. oz. 
3 
grs. 
232 
fl. oz. 
3 
grs. 
28-8 
fl.oz. 
3-8 
grs. 
25 
fl. oz. 
5-4 
The changes described in Tables XIII. and XIV. are also delineated on Plate XXXIV. 
figs. 1 & 2. 
The hourly inquiries show that there was a rapid increase of from 10 grs. to 30 grs. per 
hour in the elimination of urea during the morning hours, followed by a diminution to 
15 or 17 grs. per hour at the middle hours of the day. There was a second elevation 
to 25 and 29 grs. per hour in the afternoon with its maximum at 9 or 10 P.M.; and after 
that period the final fall occurred, which reduced the rate to the lowest amount of the 
twenty-four hours. The former was the greater and the more enduring elevation. The 
smallest emission during the day occurred after the early dinner hour, and the second 
elevation followed the tea meal. On March 2, when the greatest evening elevation 
occurred, there was an unusually large ingestion of food, viz. 40|^ oz. of solid food (in- 
cluding 9 oz. of meat and bacon), and 68 oz. of fluid, and there was a sense of oppression 
or of excess in the evening. On comparison of these observations with those made at 
longer intervals, there appears some disagreement, since the latter (Table XVI.) did 
not usually show any very distinct evening increase ; but it may be stated in explanation, 
that the longer interval between the inquhies prevented the discovery of the full fall 
after midday, and by taking the average of a part of the morning increase with a part 
of the subsequent fall, and again an average of a part of the fall with a part of the sub- 
sequent increase, the effect of both seemed to be nearly lost. 
The more frequent inquh-y at each quarter of an hour, shows yet more clearly the 
rapid changes which occur during the morning hours. Table XIV. shows that a 
maximum rate of nearly 55 grs. of urea per hour occurred in 3^ hours after the break- 
fast, and w^as followed by a decline to less than half that amount in the following quarter 
of an hour. The second part of this inquiiy shows the comparatively low and uniform 
ate of emission after the midday hours, and also the commencement of the evening 
elevation. 
Hence it is proved that when meals are taken at the hours adopted by the mass of 
tne people, there is a rapid and maximum excretion of urea in the hours following the 
breakfast, with a subsidence at about the early dinner hour. There is no increase 
immediately following the dinner, but after the tea meal and in the early evening hours 
there is a second increase, which is finally lost in the night hours. 
