448 Journal of the Department op Agriculture. 



Fl(;.ll. I'oj) l'hoto(iraijli. — Sheet beiii.ii' plueed uver tree with tlie help of tVnilless 

 hanibdo derrick poles.' The poles in this case are needlessly long. Middle 

 Pliofograpli. -Slieet Ix'innf placed over tree with the help of footless derrick 

 poles. Ill this case the poles are a little shorter than is desirable. Jiotfuiii 

 Photograph. — Dome cover placed over a tree withithe hel]) of 1);miboo3. 



