on  dir,  fee.  201 
had  the  common  property  of  all  putrid  effluvia,  that  of 
rendering  common  air  noxious. 
exp.  xi.  Air  taken  from  within  a privy  was  found  in 
feveral  experiments  to  be  equally  good  with  the  common 
atmofpheric  air.  One  trial  only  gave  a different  refult; 
here  the  external  air  being  62°,  that  of  the  privy  was 
only  6o°. 
The  refult  of  thefe  experiments  was  contrary  to  my 
expectation,  and’  I was  not  fatisfied  without  making  feve- 
ral  trials.  Sir  John  pringle  obferves,  that  the  faces  hu- 
mana  are,  perhaps,  in  a natural  ftate  little  if  at  all  in- 
fectious. Thefe  experiments  confirm  the  juftnefs  of  his 
fuppofition.  The  recent  excreta  of  a perfon  in  perfect 
health  are  here  under  flood;  in  putrid  difeafes  they  muff; 
neceflarily  partake  of  the  general  ftate  of  the  fyftem, 
and  become  very  noxious  and  infectious, 
exp.  xii.  The  following  experiments  were  made  to 
difeover  the  effets  of  vegetable,  effluvia  upon  air.  They 
were  put  into  a phial  of  air,  containing  eight  ounces, 
immediately  after  being  gathered  out  of  my  garden; 
the  time  of  ftanding  together  half  an  hour,  except  in  a 
few  cafes  particularly  noticed. 
Flowers 
