804 
DE. SMITH ON THE ELimNATION 
September and January, with opposition in the former year, and in J uly and March in 
the latter year. 
Elimination of Urea. — The total yearly average was less in the latter than in the former 
year ; but the general course throughout the months of the year was the same. The 
average daily elimination, however, was greater in March (both), J uly, and August, but 
particularly in August, whilst the month of the greatest defect was September. In refer- 
ence to this difference, it must be remarked that the months of greatest divergence were 
those of difference in the opposition of temperature and atmospheric pressure, and 
also that the conditions recorded in the month of September were very different in the 
two years. It has been remarked that in both years August and part of September 
were spent at Scarborough, and that there was doubtless some increase of nitrogenous 
food and exertion ; and m reference to food, the increase was certainly greater in the 
latter than in the former year, and may account for the excess of urea in August. In 
reference to the divergence in September, it is to be remarked that in the former year 
only six days were mcluded, and those were spent at Scai:borough ; whilst in the latter 
year twelve days were referred to, and all of them were spent in London ; and hence 
nith difference of conditions there were differences of results. The highest daily elimi- 
nation of lu-ea occurred in the latter and the least in the former year. 
Elimination of Urinary Water. — The quantity of urinary water evolved was less in 
the latter than in the former year, and the difference occurred in every month of the 
year except March and May, but chiefly in the summer season. The greatest defect 
was 10 oimces daily in August. The defect in the winter half of the year was not con- 
siderable. 
Weight of Body. — The foregoing differences render it very desirable to ascertain in 
what degree the weight of the body had increased with the diminution of excretion of 
fluid, and to compare the weight in the two years. The latter information cannot be 
given, since the inquiries in reference to weight were commenced only at the end of the 
preceding year ; but the former may be abundantly supplied. The general expression 
is that the weight increased rapidly and greatly from April to October, with a decrease 
in May and November, and a second increase to the end of the year. The increase was 
about 10 lbs. from February to October; and thenceforward the monthly average varied 
in both directions within limits of 12 ounces. Hence, with the conditions of the year, 
the habits during the year, and the lessened elimination of fluid by the kidneys, there 
was a marked increase in the weight of the body. 
It may be added as a general expression, that whilst the special conditions of each 
year caused and permitted variations in the vital and physical actions of the body, there 
was such a general influence exerted that the course of the changes remained the same.] 
7. Relation of Urea to exertion. 
The effect of exertion has, until very recently, been determined only in an indefinite 
