IXfiECT EXTEEMI.NATOKS 117 



ure in the extract, leaving more or less of a dry deposit 

 on the pipes. This should be moistened with water the 

 nrxt day and on the following day renewed with pure 

 extract. Repeat this general programme as necessary, 

 depending of course upon the condition of the houses as 

 to freedom from insects. In exceptional cases it may be 

 necessary to put the pure extract on the*pipes every . 

 day for two or three days, but the exact line of procc# 

 ure in these cases of exception can, of course, only be 

 determined by the personal judgment of the part}' in 

 charge of the house." 



There is still anotlier method very convenient on a 

 small place, and exceedingly handy when it is desired 

 to treat only a few houses. Its work is thorough when 

 usedfor green fly, but has no perceptible effect on young 

 .•^cale, spider or mealy bug, as claimed )iy some for va- 

 porized extract. It also possesses the merit of great 

 simplicity. Procure three oil stoves having a four-inch 

 burner. Place one in the south walk of a h unclrcd foot 

 house, and the others within twenty feet of either end. 

 Talce two and one-half pounds of prepared tobacco dust 

 and divide into three parts. A very convenient vlish 

 for holding this is a common tin pie plate. Give each 

 its proportion, place the plates on top of the stoves and 

 turn up the flame, but not enough to have it smoke, 

 and leave until consumed, which should take about half 

 an hour. This process precipitates the killing proper- 

 ties of the tobacco with very little smoke. For a house 



