to be more likely. This, however, is a question, which cannot be 
settled until later on. For the present we may be contented to 
have found a view which explains the observed phenomena in 
an exceedingly simple and plausible way. 
[ have pointed out in this paper that there are two possibilities, 
a zj 5: be 
red liquid 
7] 
red liquid 
— 
vapour 
Ig, He Fig. é 
