194 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Table III. 



Observations in Table II., arranged according to the Amount and 

 the Sign of the Differences. 



Table IV. 



1849, Sept. 10. The aneroid stood at 30.39. It was placed under 

 the receiver of an air-pump, and the atmospheric pressure diminished 

 by five inches. When the air was admitted, the index moved forward to 

 30.35. It rose to 30.375 in two or three minutes. The following 

 table embraces similar experiments, with their results. 



