9 
house, and the third along the side of the house. Hemlock boards 
an inch thick and 4 inches wide are nailed to the top and bottom 
around the sides and an additional 4-inch board is nailed between at 
Fig. 4.—The house and the fly. 
such a height that a netting 4 feet wide will reach from it to the strip 
at the bottom and a 3-foot netting from it to the strip at the top, thus 
making, when the netting is properly nailed on, a wall 8 feet high. 
The posts are so 
placed as to divide 
the fly into sections 
corresponding to the 
pens of the house, 
thus giving each lot 
of 50 pairs a separate 
pen and a communi¬ 
cating fly. An as¬ 
sistant is required to 
stretch the netting 
while it is being 
nailed on. It is a 
good plan to fasten 
one end and the top 
edge first, then the 
assistant with a stout 
forked stick can 
stretch the netting smoothly while the lower edge is being securely 
fastened. Doors opening into each section are provided. These 
are placed 1 foot from the side of the house, all in line, covered 
177 
Fig. 5.—The house and the fly. 
