60 PROCEEDINGS OF THE AMERICAN ACADEMY 



which it would only be necessary to measure the "volume of the gas 

 transpired in a known time. These, with experiments upon other gases, 

 and also upon the validity of Poiseuille's law, I hope to be able to ac- 

 complish. The many points of superiority of this apparatus, and the 

 excellence of these preliminary results, would seem to indicate more 

 accurate determinations than others preceding them. 



As a result of these experiments, it would appear that the viscosity 

 of air increases proportionally to the 0.77 power, nearly, of the absolute 

 tempei-ature between 0° and 100° C. Tiiis value corresponds quite 

 closely to the | power, and we might infer tiiat this was tlie value of x 

 towards which the experiments pointed ; but as I feel assured that 

 further experiments will furnish still more concordant results, I should 

 be unwilling to accept 0.75 until tiiese had been performed. The gen- 

 eral agreement of my results with the numbers of iMeyer and von 

 Obermayer would seem to point to the fact that the value of x cannot 

 be as great as unity, and is probably about 0.75. 



