1895.] The Significance of Anomalies. 135 
First, similarity of structure, either in the ordinary animal 
or in the one showing variations, is not necessarily a proof of 
descent. Second, those very irregularities, which we call ab- 
normal, point to a law in accordance with which very diverse 
animals have a tendency to develop according to a common 
plan. This be it noted, in no way denies the possible in- 
fluence of surroundings. 
