234 GARDEN PROFITS 



sometimes used, such as quicklime or potassium 

 sulfid. But the formalin treatment is effective 

 and handy. 



For Small Lots. Take two fluid ounces of formalin 

 (this is the same as one-eighth of a pint) to four 

 gallons of water. Immerse the uncut potatoes 

 in this and let them remain for two hours. Then 

 remove them, dry them a little and plant in scab- 

 free soil. 



For onion smut use two fluid ounces of formalin 

 to four gallons of water. Sow your seed, but leave it 

 uncovered in the drill. Then sprinkle the seed 

 lying in the drill with the formalin solution, thus 

 moistening slightly the ground just adjacent to 

 the seed. 



For grain smut use two fluid ounces of formalin 

 to six gallons of water. Pour out your seed in a 

 pile on the floor. Sprinkle it with the formalin 

 solution enough to moisten 'all the grains. Let 

 stand for three or four hours. Then spread out 

 and dry before planting. 



PARIS GREEN 



The old standby for leaf-eating insects is Paris 

 green. Time was when London purple was much 

 used, but its composition was variable, and consid- 

 erable amounts of free arsenic were often present, 

 causing burning of the foliage. To-day arsenate 

 of lead, which is considered in the next section, is 

 replacing Paris green. 



Standard Formula. Paris green may be used 



