Review of Darwin’s Theory on the Origin of Species. 163 
Hg ary; and that when it has ence begun to vary, its var 
neties are not the less but the more subject to variation. “No 
case is on record of a variable being ceasing to be variable un- 
der cultivation.” Tt is fair to conclude, from the observation of 
“ary contingency, under all circumstances, with all organic be- 
8% 88 some authors have thought.” No one sup varia- 
wn goal occur under.all circumstances; but the facts on the 
‘aordinary inherent tendency to vary, and likewise to withstand 
diverse climates, it is asked: 
