investigate, ana see what it is. Let 
us go in to the held early in July; 
here are some thistles, fhey are just 
Coming into bud. Examine them 
closely, and you find a number of flies, 
more than one on each bud. 
seem busy ab6ut something; 
are laying their eggs in the thistle 
tie-bud fly, and the land was overrun 
with thistles, what should we not have 
to say in praise of anything that would 
rid us of them? So perhaps we owe 
some gratitude to this little fly, which 
has worked so quietly that most of us 
jjave not noticed it. but has spared us 
even the trouble of thinking how to 
I 
25 
