184 Retrograde Varieties 



be answered by long and arduous work in well- 

 equipped laboratories; they are not to be at- 

 tempted by every one. But there are other 

 problems which the most complete of institu- 

 tions are not able to study if opportunity is not 

 offered them, and such opportunities are apt to 

 occur more often in fields, gardens, parks, 

 woods and plains, than in the relatively small 

 experimental gardens of even the largest in- 

 stitution. Therefore, whosoever has the good 

 fortune to find such sports, should never allow 

 the occasion to pass without making an investi- 

 gation that may bring results of very great im- 

 portance to science. 



