SHADE TREES 179 
Collection of native wood specimens. A collection of 
native wood specimens that may be used as an aid in 
learning the names of trees and the structure of the wood 
may be made and mounted so that it will be ready for 
use at any time (see 
Fig.99). Gather sticks 
that are ten or twelve 
inches long and about 
two inches in diam- 
eter. After they are 
wellseasoned, cut out 
sections six inches 
long and saw them 
lengthwise through 
the center. In cut- 
ting the green wood 
it is necessary to al- 
low this extra length, 
as the pieces will 
“check,” or crack, 
in the process of dry- 
Fie. 99. A Collection of Wood Sections made 
ing, and the cracked by Sixth-Grade Pupils in Ipava, Illinois 
ends must be cut off, 
to obtain an even surface. Make the cut surfaces smooth 
with sandpaper and give them a coat of shellac and a 
coat of varnish. The name of the variety may be placed 
on the lower end of the section. 
Pests. To hold in check the elm-leaf beetle, spray 
with arsenate of lead when the larve first make their 
