[mcLean] 



ADSORPTION OF HELIUM 



81 



collected in tubes over mercury at K. The difference between the 

 amount of gas introduced to the apparatus and that pumped out, was 

 considered to be the amount adsorbed by the charcoal. 



The following table gives the results of a series of experiments. 



These results go to show that a very small quantity of helium is 

 adsorbed by charcoal at the temperature of liquid air. 



This work was carried out under the direction of Professor E. F. 

 Burton. 



Sec. Ill, Sig. 6 



