180 THE ENTOMOLOGIST. 



but he fails entirely in showing us how this most desirable 

 object may be accomplished; nevertheless he adds the 

 following rational suggestions : — 



" 1st. Cut early, and feed-off while green, the clover crops 

 which are known or supposed to be much infested by the 

 Apion. 



" 2ud. Carefully avoid allowing the clover crops to remain 

 more than two or three years in succession on the same 

 ground. 



" 3rd. Avoid also allowing the clover, which is much 

 infested by the weevil, to ripen or run to seed. 



" 4th. Alternate and vary the culture, as previously pointed 

 out. 



" 5th and lastly. We can produce the drying of the clover 

 by the German method, viz. fermentation, by making brown 

 hay (foin brun). The alcoholic vapours, the deleterious gases 

 which are formed during the fermentation of clover stacked 

 when green, the high temperature produced in the stack, 

 suffice to destroy the thousands of larvae of the Apion, which 

 cannot endure so great a heat." 



In conclusion, 1 earnestly entreat those scientific farmers — 

 who are now so numerous, but who were hardly known and 

 totally unappreciated when, in 1832, I began my investiga- 

 tions of " blight" so-called — to assist me in publishing in this 

 journal the result of their observations.] 



Gall of a Cecidomyia on Ground Ivy. — Will you kindly 

 oblige me by sending the name of the enclosed galls? They 

 are on the leaves of ground ivy, and, besides their general 

 interest, have a curious propensity of falling off when 

 touched, leaving a hole through the leaf. — Walter W. 

 Reeves ; Royal Microscopical Society, Ki/iy's College, July 

 22, 1872. 



[Not recognizing these interesting productions, I forwarded 

 them to Mr. Albert Miiller, who has paid much attention to 

 these and similar productions, and he has kindly supplied 

 the following interesting information : — 



"The enclosed little tubular bodies on Glechoma hede- 

 racea are galls, and produced by Cecidomyia bursaria of 

 Bremi. Each of these tubes is inhabited by one pale yellow 

 larva : when the larva is full fed the tube becomes detached 

 and drops to the ground, leaving in the leaf the well-defined, 



