on  Air,  See.  199 
during  Welter  ly  winds,  and  the  worft  when  it  blew  from 
the  Eafterly  points. 
exp.  Vi.  The  difference  of  the  air  a little  way  out  of 
the  city,  from  that  in  the  city  itfelf,  is  perceptible  enough. 
Auguft  9th,  the  air  of  the  city  was  59%  beyond  the  city 
walls  62°.  On  the  nthof  the  fame  month,  the  firft 
was  6o°,  the  laft  6-2°. 
exp. -Vii.  Common  air  being  brifkly  agitated  with 
water  for  half  an  hour,  was  found  to  be  made  worfe.  In 
one  experiment  it  was  reduced  from  590  to  57°;  in  ano- 
ther, from  6i°  to  590;  in  a third,  from  6i°  to  570;  in  a 
fourth,  from  62°  to  5 8°.  Air  obtained  from  glazier’s 
putty  *by  the  nitrous  acid  was  meliorated  by  the  fame 
procefs. 
In  order  to  find  the  effects  of  animal  exhalations  upon 
air,  the  following  experiments  were  made. 
exp.  viii.  The  air  of  my  bed  at  night  I found  to  be 
62°,  the  next  morning  it  was  reduced  to  58°;  this  was 
feveral  times  repeated.  The  diminution  here  will  appear  • 
very  conliderable  upon  obferving,  that  it  was  the  effedl 
of  the  breath,  &c.  of  a fingle  perfon,  in  a large,  airy 
room,  the  bed-curtains  always  open,  except  on  the  fide 
facing  the  window,  which  is  quite  open  to  large  gardens, . 
and  never  fhut  with  curtains*  It  fully  fhews  the  unwhole- 
fomenefs 
