Description of a Tobacco Fumigator. 141 



keep the tobacco close and compact, I have constructed a 

 plunger (c), with two plates, placed at some little distance from 

 each other, and pierced with conical perforations with their 

 bases upwards. This plunger, by its weight, keeps the tobacco 

 from flying about in the cannister in working the instrument, 

 and thus allows the tobacco smoke to ascend through it, with- 

 out any of its perforations being obstructed, until the whole 

 charge is consumed. I need not point out with what con- 

 venience this instrument may be used in forcing houses, pits, 

 and frames, nor the advantages which result from it. 



The upper part of the section represents the lower end of 

 the patent syringe to which the cannister is attached. 



