170 THE NATURALIST IN BERMUDA. 
The following paper on “ Experiments made at Bermuda 
on the Carbonic Acid in the Atmosphere, in the year 1836,” 
from the pen of Lieut.-Col. Emmett, appeared in the Lon- 
don and Edinburgh Philosophical Magazine of 1837. 
PER QUANTITY. 
EXPERIMENT I.—September 25th. <A glass receiver of 
3920 cubic inches, = 15:5 gallons, was taken to the north 
side of the island, beyond any building. Wind north, day 
fine, thermometer 79°. Into this, after well washing with 
rain water and collecting the air, were put 1500 grain mea- 
sures of lime water. The receiver was then well closed 
with a cork and set aside. 
September 24th, 44 pm, thermometer 82°. Some of 
the lime water used was tested, 1500 lime water taking 410 
test sulphuric acid, the liquid would be 1-009 test. It took 
350 to saturate the remaining lime water, consequently left 
80 for the carbonic acid in the air. (The receiver was not 
long enough exposed; my bottle was two gallons; it was 
exposed three or four days, and agitated to exhaust the air. 
Consequently ten times as much would probably be required 
by ten times the size of the bottle.) 
EXPERIMENT I1—September 25th. Receiver and acid 
as before, and the lime waters but 210 for neutralization ; 
wind strong from south-west ; thermometer 80°. 
September 28th. The lime waters from the receivers took 
120 grain measures for neutralization, leaving 90 for car- 
bonic acid gas; a very nearly similar result as before. 
EXPERIMENT 11—October 2nd; at 5 p.m.; wind south- 
west, at the cessation of a heavy gale, with much rain ; 
thermometer 78°, barometer 30°00. Receiver and acid as 
