102 DUST AND ITS DANGERS. 



among its ingredients the living germs which 

 have come from the bodies of persons suffering 

 from bacterial disease. This dangerous ad- 

 mixture in dust is always possible in populous 

 towns, and while the danger from this source 

 is in general not very imminent, it is increased 

 in direct proportion to the accumulation of dust 

 which is allowed to occur either in private 

 houses or places of assembly. 



Two important means exist for getting rid 

 of dust either in private houses or in places of 

 assembly or public conveyances. The first is 

 to sweep and to stir up the dust with windows 

 and doors wide open, so that the temporarily 

 floating particles may be largely carried out-of- 

 doors, where they will be soon diluted and swept 

 off. It should, in the second place, be borne 

 in mind that in still rooms the dust, and with 

 it the larger part of the aerial germs, will 

 settle, within a few hours, so as to leave the 

 room almost entirely free from them. If, now, 

 the mopping of the floor or the dusting of furni- 

 ture with moist cloths be practised, the larger 

 part of the dust may be completely removed 

 from the rooms. The completeness of this 



