274 FUMIGATION METHODS 



which would neverbe equaled in ordinary practice, a 

 majority of the varieties tested showed no injury and 

 germination was practically, the same in each lot. 

 Seeds of the grass family appeared more tender than 

 other kinds. Experiments were also conducted upon 

 grain in bulk, using the liquid at the rate of one pound 

 to 100 bushels of grain. The exposure lasted twenty- 

 four hours. No injury could be detected in even the 

 most delicate seeds. 



Treating seed and grain in bulk. Such seeds as 

 corn, wheat, rice, peas, beans, cow-peas, and others 

 are frequently attacked by insects and seriously injured 

 or entirely destroyed. No insecticide now known is 

 equal to carbon bisulphid for the destruction of such 

 pests. Seeds or grains to be fumigated should be placed 

 in barrels, bins, or rooms. The enclosure should be 

 tight. Apply the carbon bisulphid as directed above, 

 at the rate of from one to one and a half pounds for 

 each 1,000 cubic feet of space. A bin or room ten feet 

 each way, or 1,000 cubic feet, will hold about 100 

 bushels of grain. A barrel or small enclosure will 

 require a larger proportional amount unless it is very 

 tight. Place the liquid on top of the seed in shallow 

 vessels. A small bin or barrel should be covered with 

 heavy blankets to better retain the vapor. Close 

 the receptacle for 24 or 36 hours. The germinating 

 power of the seed will not be injured in the least, other 

 conditions being normal. Rye, millet, barley, and 

 crimson clover are the most liable to injury and should 

 receive proportionately a less amount. 



As many of these pests enter the seeds in the open 

 field while the grain is in shock, stack, or growing, it is 



