THE MONTHLY BULLETIN. 



323 



treated in a tannin bath. A suitable outfit for this work is shown in 

 Fig. 310. 



The tank shouhl have a capacity of from two hundred and fifty to 

 three hundred gallons. Oakbark extract of tannin is used at the rate 

 of one pound to every five gallons of water. Six or eight pounds of 

 tannin and the amount of water removed with the tent should be added 

 after each is dipped. 



The tannin solution should l)e lirought to a boil and the tents im- 



Wf^.' W' ' 



Fig. 310. — Apparatus for clipping tents in tannin to prevent mildew. (Aftt^r 



Woglum. J 



mersetl for half an hour after which they are removed andspread out 

 to 'drv. 



A forty-five-foot tent will shrink about one foot all around in dipping 

 ( avowing for some stretching. by use afterwards). 



The cost of dipping for tannin, fuel, labor, etc., amounts to about 

 $1.2(Vto $1.^- outside of equipment. : 



The wi'it'gr'is indebted to INIr. R. S. Yaile, horticultural commissioner 

 of Ventura County, for the information on shrinkage and cost of work. 



