448 



SCIENCE 



[N. S. Vol. XXXII. No. 822 



SOO 1000 UQO 1000 ZSQO 3000 JfOO '/OOO tSoo Sooo 



l',X10'' 

 YlG.~i 



but the value of e should in no way be af- Cunningham's theory, and we shall soon be in 



fected thereby. It is of immense interest to a position to settle this point and to make a 



know whether varying the mean free path by further communication upon it. 



varying the pressure will affect the value of A R. A. Millikan 



in the way in which it ought according to The Univeesity of Chicago 



