216 Dr. John Gorrie on the 
of degrees one pound of water is heated ina minute. If we di- 
vide this amount by 140° F., for the latent heat of water, and 
the standard measure of heat I have adopted, it will give (480 
140 = ) 3-429, for the number of pounds of ice that the heat would 
» melt per minute. This product being again multiplied by 360’, iw 
for the duration of the experiment in minutes, hg (3° 429 
360 =) 1234, or, multiplied by 1440, for the number of minutes 
in'a day, gives (3-429 x 1440 =) 4938, for the number of pounds 
of ice which the heat evolved in the preceding experiment, would 
melt in a 
Bat there are several circumstances which interfere with this 
om simple calculation, and which require to be considered, and their 
~ distinct effects computed before we can arrive at a just conclusion 
as to the value of the experiment. 
; rom the construction of the perforated pe or “roses,” 
through. which the water of injection was delivered to the air in 
_ the act of condensation, as well as from the aaineciils of the 
. 
sation of bolt ons vapor, the air-pipe, com- 
en one Teservoir and the engine, was free from 
e e. differ ent.s DE cifi 
ary pomenan ssure and ee 
lon 1 at-gvhich ex) iments may, b be 
ia pe aves ion, and ois cae which 
e not led me to satig ‘A tigps orto an arrange- 
m sufficienthy ag istify my P 
ns them: .to the public. . 
ll the, 
approximations to 
ender sheen ees 
