72 



CALIFORNIA CITRUS CULTURE. 



several years of trial with the drills it is becoming the unanimous 

 opinion of fumi gators that by far the best all around tent material is 

 the eight-ounce army duck. Though somewhat coarse and open it is 

 able to hold the gas well and may be used almost twice as long as the 

 drills. 



Tents should be ordered a little larger to allow for shrinkage when 

 dipped. 



FIG. 49. Apparatus for dipping tents in tannin to prevent 

 mildew. (After Woglum.) 



Dipping. To prevent moulding and rotting, new tents are usually 

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

 Fig. 49. 



The tank should 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 



