22 LIVERPOOL BIOLOGICAL SOCIETY. 
the limits of variation—if indeed there are any—and the 
conditions which determine its direction and extent in any 
particular species. The relative importance also of the 
external conditions on the one hand and of the mixing of 
hereditarily acquired maternal and paternal and their 
respective ancestral tendencies on the other hand in 
influencing variation is still quite unknown, and is well 
worthy of the attention of the able and enthusiastic young 
biologist who is ambitious of leaving a name immortal in 
the annals of his science, and who does not shrink from 
what is perhaps the most difficult and the most laborious 
piece of work awaiting investigation. That man who can 
tell us—not as a mere matter of more or less probable 
speculation, but as an accurate induction from careful 
and adequate observation and experiment—why certain 
variations occur and what conditions influence them, has 
reserved for him a position in the Temple of Evolution 
second only to that of Charles Darwin himself. 

