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. 



PEE 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, 4^ p.m., thermoiueter 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 

 330 to saturate the remainiag 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 ii. — September 25th. Eeceiver 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 in. — October 2nd ; at 5 p.m. ; wiad south- 

 west, at the cessation of a heavy gale, with much rain ; 

 thermometer 78°, barometer 30'00. Eeceiver and acid as 



