46 DKN8IT1KS OF ()XY(iKN AND HYDROGEN 



cloth. Their iliffereiice of \\ei<;ht was then determiuetl as thev hiiiiLr in tlie desic- 

 cator ; it was found to be, as just given, 41.8190 gr. 



( )ne of the globes was now washed with distilleil water and at once wipeil 

 dr\ and replaced in the desiccator; this was at 12.40 p.m. on April 30. The fol- 

 lowing observations were tlun made : 



'o 



Date. Hour. Weight, gr. 



The mean is 41.8168 ; so that the wa.shed globe had lost 2.2 milligrammes. 



On May 11, the same glol^e was waslied again, its counterpoise being simply 

 wiped as before; both were replaced in dry air at ii.;Jii a.m. Tlie following obser- 

 vations were made : 



I 



The mean is 41.8172 ; s^o that the globe had lost no more in weight liy the 

 second washing soon after the first. 



On May 14, the same globe was washed by scouring gently with powdered 

 pumice-stone and distilled water. It was then wiped, passed through tlif tlame of 

 a Bunsen lamp, and leplaced in the desiccator at 5 p.m. The following observa- 

 tions were made : 



On May 18, at !• a.m., the same globe was washed with pumice-stone, using 

 hard friction; it was then wiped and jiut in the desiccator at 12.;)ii p.m. Weighings 

 were made as follows : 



