Sr 
(7) An intermediate class, containing a very large 
number of organisms which occupy a position 
midway between the two extremes ; and 
(72) The resistant organisms, or those capable of 
resisting the action of sunlight for considerable 
length of time (vide the remarks on cloace, 
Grunthal, etc.) 
‘It is not proposed to discuss the position of any partic- 
ular species of organisms in these three classes, until the 
conclusions arrived at in the further work on this subject 
have been considered. 
