40 INJURIOUS INSECTS OF I9Q09Q AND IQIO. 
A hopperdozer was constructed according to the plans given in 
the drawings which accompany this report, and was covered with 
canvas; the canvas being painted on the inside, in one trial, with 
crude oil, and in the other with tree tangle-foot: the idea being to 
drag the hopperdozer along the rows cf small trees, the trees 
Fig. 17. Hopperdozer for use on nursery rows. Franklin. 
