186 Forestry Quarterly 



before treatment and by stacking the treated frames in a warm 

 room with blocks between to allow good circulation. Carbo- 

 lineum, being more volatile, dried somewhat more rapidly than 

 the creosote. 



The amount and kind of material used for each frame and the 

 approximate cost at Priest River are given below : 



Lumber Feet B. M. Cost 

 Frame 



4 pieces 1 x 2—16 feet 10>^ 



1 piece 2 X 2— 10 feet 3>i 



Screen Cover 



2 pieces 2 x 2—16 feet 10^ 



1 piece 1 X 2 — 8 feet \yi 



Lath Cover 



2 pieces 2 x 2—16 feet 10>^ 37' at $20 $0.74 

 1 bunch lath . 05 M at $2.50 . 13 



Hardware 



1/2 pound 8 penny barbed box nails at 6 c 03 



^/j pound 30 penny common nails at 4c 02 



Vs pound 3 penny common nails at 5c 01 



2 dozen 2-inch No. 8 wood screws at 5c 10 



1 pound galvanized poultry netting staples 10 



75 square feet 2 mesh, 18 gauge, galvanized hardware cloth at 23^ c. . 1. 87 



Total cost of material per frame $3. 00 



Approximate cost of labor per frame 1. 00 



Total cost per completed frame $4. 00 



A good grade of common pine lumber should be used in the 

 frames, and if appearance is no object it should be left rough 

 for greater strength and durability. It has been the common 

 practice at Priest River to use finished lumber so as to present 

 a somewhat neater appearance and take paint better. The frames 

 have been painted white with an inexpensive cold water paint 

 bought in the form of a powder. 



In the list of hardware, box nails are specified to prevent split- 

 ting which is apt to occur if large common nails are used. The 

 wood screws are used at each corner of the screen cover and 

 lath cover frames, running from the ends of the side pieces into 

 the end pieces, and help to preserve the rigidity of the frames 

 during the frequent lifting on and taking off incident when 

 counts are being made in experimental work. The hardware 

 cloth is figured on the basis of using 92^/2 linear feet of roll 4 

 feet wide for five beds. After cutting off 5 pieces 13 feet long 

 for the covers, the remaining 32^ feet is split longitudinally 

 into five equal strips 9.6 inches wide, which are then cut into two 



