20 
THE BUGOLOGIST 
When you pick them, do you stop to think why it 
grows on the leaf and not on a stem by itself? You say, 
they are not a fruit of the tree. That is right. 
A little insect, belonging in the sam$ order with the 
bees, lays eggs under the thin skin of the leaf. The cells 
of the leaf then increase very fast around the eggs thus 
forming the apple. The insect is called the Gall-fly. 
4. The Mud Wasp. 
We now have reached home. Let 11s immediately 
go into that old building and see what we can find. 
How old everything looks! You can see the day¬ 
light through the chinks in the roof. But hark! what 
noise do we here? Does it sound much like the music 
of a mason? It is, however, a mason’s voice. Wait a 
minute or so and you will see him. 
See ? There he (or rather she) goes. Did you see 
her long yellow legs? Her body is of a darker color. 
If you will go out to the well or some little pool of water, 
you will probably see her with some of her relatives, 
picking up little particles of mud and drinking water, (if 
I.may call it so). 
Let us now search for her nest to see what she does 
witli the mud. 
Look in the corners, under the eaves, back of the 
spars, or behind that tin pan leaning against the wall. 
