102 
THE HONEY-MAKERS. 
egg is hatched first, and must come out first. 
To provide for this, the mother makes a little 
opening at the bottom of each cell, through which 
the infant may escape. 
Mason Bees. 
Among the most interesting of insect-archi- 
tects must be classed the mason bees. Their nest, 
or more properly their stone house, is a dome- 
shaped dwelling, built, as one would suppose at 
first glance, of mud and clay, and looking very 
much like a rounded mass of dirt thrown against 
a roadside wall. 
Exterior Wall of Mason Bees ? Nest. 
It is composed of a great number of pellets of 
clay, kneaded together, and laid one upon another 
until the nest is completed, a little opening being 
left for the door. Within are separate cells, or 
