Inclement Weather, Diseases, Etc. 299 



meshes of which have a width of about four one-hun- 

 dredths of an inch. 



It will now be seen that if sulphur is introduced into 

 the box D [Fig. 118], and the bellows be made to act, 

 the current of air driven through the nozzle, C, will fol- 

 low the direction, H I, and meeting the sulphur running 



FIG. 119.] La VergnSs Bellows. 



through the two partitions, will carry it along, and make 

 it appear at F, in the form of a little cloud, the impal- 

 pable particles of which will deposit themselves in a 

 thin but sufficient layer, on surrounding surfaces. 



[FiG. 1 20.] Section of La Vergne's Bellows. 

 It has been objected to this instrument that it does 

 not work quickly enough, and furthermore, that the 

 weight of sulphur being placed at the front part soon 

 fatigues the operator. For which reason it is now 

 nearly superseded by M. Vergne's bellows, constructed 

 at Bordeaux. 



