J. C. Draper—Heat produced in the Body, ete. 445 
of late been customarily treated, is the more to be regretted 
as no probable amount of private effort can accomplish what 
must, of necessity, be done on an extended scale and with the 
aericultaral volaies must and will take up and continue, as 
far as possible, the investigation of the agricultural pemnsiatiilas 
of each State; but the special and local experience acquired 
by those conducting a field survey, as well as their oppor- 
tunities for extensive and comparative duerrtion: are unfor- 
tunately “not transferable,” even to the finest, quarto report. 
In order to attain their highest degree of usefulness, our agri- 
cultural colleges should teach, not merely general principles, 
together with a sufficiency of the handicrait of a i re; but 
they should be enabled to point out to each student, ‘with 
reference to his particular neighborhood, How Crops Grow, 
and How Crops 
Univ. of Miss., at 1872. 
Art. LIIL.—The Heat produced in the Body, and the effects of 
Exposure to Cold ; by JouN C. Draper, M.D. 
Tux following results were obtained in an attempt to deter- 
mine the quantity of heat passing off from the surface of the 
oe by —— ow much it would elevate the waspersis 
a known mass of cool water during a given period of 
The manner of experimenting was as follows :—Seven and a 
half cubic feet of cool water were drawn into a bath, and the 
temperature taken after careful mixing. The bath was then 
covered over for about four-fifths of its extent to prevent the 
action of currents of air, and at the close of an hour the tem- 
perature was again tested. The rise of $ a degree represented 
the amount of heat absorbed from the air during one hour, and 
was deducted as a normal error from the lts afterward 
obtained. 
During the time occupied in determining the normal error of 
ce bath ( (viz., one hour wie I ao on a sofa to bring the circula- 
ry and respira’ ns into a condition similar, as 
pda of the ee Bares to that to which they onl be submitted 
