OF ARTS AND SCIENCES. 



49 



The first column gives the temjDeratures by the air thermometer, the 

 second column the corrected readings by Baudin 8208, the third the 

 corrected readings for 8209, the fourth the deviation of 8208 from 

 the air thermometer, the tifth the same for 8209, and the sixth the 

 differences between the two Raudin thermometers. In the series of 

 eighteen comparisons which give the means corresponding to — 87°. 94 

 the average deviation of the single numbers giving the mean in the 

 fourth or fifth columns was 0°.16. 



For the sake of comparison, the figures published by Jolly are here 

 appended. 



VOL. XXI. (N. 8. XIII.) 



