MICHIGAN ACADEMY OP SCIENCE. 77 



place, in and out of the flowers. It is possible that there were more thrips 

 under the net on one side of the plant than on the other. ' 



For 35 years heads of clovers to some extent have failed to produce a good 

 crop of seeds, in some cases producing very few seeds, from the effects of 

 the clover seed midge. To what extent the results were modified by midge in 

 my experiments I am miable to tell you. Clover plants, bumblebees, thrips, 

 and perhaps others not discovered, are complex living organisms, and are 

 liable to tamper in some way with any experiments we may make with red 

 clover. 



Agricultural College, Mich. 



