OF UREA A^D UEINART WATER. 
777 
Table X. (continued.) 
Monthly Averages. 
Urea. 
Greenwich 
Means. 
Urine. 
24 
hours. 
Night. 
Basis. 
To 
midday. 
24 
hours. 
Night. 
Basis. 
To 
midday. 
Temp. 
Barom. 
grs. 
grs. 
grs. 
grs. 
in. 
fluid oz. 
fluid oz. 
fluid oz. 
fluid oz. 
I860, March 
19-25 
15-8 
20-8 
44-2 
29-467 
2-17 
1-1 
1-83 
April 
20-3 
15-9 
20-38 
26-7 
42-9 
29-796 
2-27 
1-28 
2-03 
6-23 
May 
22-7 
20 
19-8 
24-6 
53-8 
29-746 
1-89 
1-41 
1-45 
2-5 
June 
22-5 
18-2 
22-6 
54-8 
29-613 
2-21 
1-59 
2-46 
July 
21 
18-7 
18-9 
57-6 
29-845 
2-3 
1-96 
August ... 
26-8 
57-7 
29-556 
2-5 
September 
27‘2 
56 
30-023 
2-7 
October ... 
21-6 
15-4 
20-9 
50 
29-791 
2-33 
•99 
November 
23-1 
12-9 
18-6 
40-35 
29-537 
2-15 
•93 
2-11 
December 
17-6 
15-7 
21-13 
36-3 
29-491 
2-18 
1-16 
1-89 
1861, .January ... 
19-6 
16 
19-6 
23 
32-7 
29-706 
1-99 
•99 
1-97 
4-12 
February... 
21-3 
l6‘5 
20-97 
28 
41-2 
29-959 
2-2 
1-28 
2-32 
5-29 
March 
19 
16-4 
20-7 
42-7 
29-984 
2-24 
1-7 
2-39 
Both the Plate and the Table prove that the least hourly elimination of urea occurred 
in the night, and that the “ bask qiiantity ” was higher than that of the night. The 
average of the whole day was greater still, and the highest elimination took place in the 
morning hours, uj) to, or a little beyond midday. On the average of the whole yearly 
returns combined, the dilference in the amount eliminated at the different periods of 
the day is sufficiently great ; for if the average excretion of the whole day be accepted 
as the standard, that of the night was 24, and the “basis quantity ” was 6-4 per cent, 
less, whilst the increase to midday was 17*5 per cent, greater than that standard. The 
following are the average quantities excreted at these periods : — 
"WHiole day. Night. Basal quantity. To midday, 
grs. grs. grs. grs. 
Urea .... 21-7 16-5 20-3 25-5 
The relative diminution of the excretion in the night is greater than this mode of com- 
parison indicates ; for the standard of the day has been lowered by adding the diminished 
quantity of the night, in order to obtain the average of the whole day. Nothing, how- 
ever, would be gained by separating the day from the night hours, so as to use the 
rate of excretion in the former as a standard of comparison mth the latter, since no two 
observers agi’ee as to the hours which constitute the day and the night respectively.' 
The Table also imperfectly exhibits the amount of excretion before midday, since that part 
of the investigation was not pursued at the period of the year when the largest elimina- 
tion of urea was proceeding ; but the second series of inquiries remedy this defect. 
The monthly averages in Table X. vary the order above given in but one instance, 
when the basis quantity was -2 gr. per hour less than that of the night. There is also 
an unimportant exception in the weekly averages^ in reference to the rate of the night 
excretion, in which the night exceeded the day excretion by ’2 gr. per hour. The 
former occurred in May, and the latter in December. 
