on.  Air,  Bcc  2,19 
2.  It  is  purified  by  rains  and  winds,  efpecially  Wefterl y 
ones. 
3.  It  is  confiderably  worfe  in  cities  and  large  towns, 
than  in  the  country,  even  at  a fmall  diftance. 
6.  It  is  quickly  poifoned  by  the  effluvia  from  animal 
bodies,  even  whilft  perfectly  fweet  and  free  from  pu- 
tridity. 
7.  Vegetable  matters,  when  not  in  a growing  ftate, 
have  a fimilar  effedt,  and  in  a degree  equally  powerful. 
8.  And  this  is  not  any  ways  owing  to  their  aroma  or 
odorous  parts. 
9.  Phlogifton  rifes  alone. 
10.  Phlogifton  is  imperceptible  to  the  fmell,  per fc. 
1 1 . Phlogifton  is,  per  fe,  peftilential. 
1 a.  The  abfence  of  difagreeable  fmells  is  by  no  means 
a criterion  of  the  healthful  ftate  of  jails,  hofpitals,  8cc. 
or  of  their  freedom  from  infedtion. 
13.  Mere  odour  does  not  injure  the  air,  nor  do  vola- 
tile alcalies. 
14.  The  air  is  generally  pure  over  waters. 
1 5 . The  air  is  greatly  injured  by  the  effluvia  from  the 
thick  mud  of  bogs  and  marlhes. 
16.  But  this  is  much  obviated  by  laying  them  under 
water. 
Vol.  LXVIII.  Ff 
17.  Air 
