or UEEA Am) TJEmAET WATEE. 
751 
observations included thirteen days, besides the week of preliminary dietary and pre- 
paratory arrangements.] 
I propose to state the results of these several inquiries in the following order ; — 
1. The absolute amount of urea evolved daily (p. 765). 
2. The absolute amount of urinary water (p. 769). [Its relation to weight of body, 
p. 771.] 
3. The relations of the daily amount of urea and urinary water (p. 772). [Contrast 
of daily quantities during two successive years (p. 802.)] 
4. The relations of urea and urinary water to the period of the day with ordinary 
food, during fasting, and with special articles of food (p. 774). 
5. The relations of urea, urinary water, and weight of body to the cycle of the 
week (p. 793). 
6. The relations of urea and urinary water to the cycle of the year, with the influence 
of temperature and atmospheric pressure (p. 796). 
7. The influence of the treadwheel and other prison labour over the excretion of 
urea, chloride of sodium, urinary water, and fgeces, both with an ordinary diet and 
with the addition of certain special kinds of food (p. 804). 
8. Certain relations of urea, chloride of sodium, and urinary water to food (p. 818). 
9. The relation of the excretion of urea to headache and stomach-derangement (p. 823.) 
10. The relation of urea to carbonic acid (p. 824). 
11. The relation of urea to nutrition (p. 825). 
The inquiry into the relations of urea is one of extreme complexity ; and I premise a 
scheme of the modifying circumstances which act together and which require considera- 
tion. 
Melations of Urea. 
1. PEODUCTION. 
2. ELIMINATION. 
1. Production: (chiefly) Food. The amount taken into the blood. 
The nitrogen which it contains. 
The general appetite. 
The temporary variations in the appetite. 
The period of the year. 
2. Ehmination: (chiefly) Fluids. The emission of urine. 
The general appetite. 
The variations in the appetite. i 
The emission by other outlets than the kidneys. 
The atmospheric pressure. 
The atmospheric temperature. 
The state of the health. 
The period of the day. 
3. The variation in the vital actions. 
4. The habits of the subject of experiment. 
