on  Air,  8cc.  209 
occurred,  it  is  fo  fmall,  that  I attribute  it  rather  to  fome 
little  inaccurracy  in  conducting  the  experiment.  Nor 
did  I think  it  neceffary  to  repeat  the  trials,  being  fatisfied 
that  their  poifonous  efFeCts  in  the  twelfth  and  thirteenth 
experiments  were  not  in  the  leaft  owing  to  their  odour, ; 
but  to  their  organized  ftructure,  tending  to  diflolution 
from  the  time  they  are  deprived  of  nourilhment;  fuchi 
is  the  perfect  agreement  between  vegetable  and  animal 
fubftances. 
It  is  demonftrable  from  hence,  that  the  filling  of 
rooms  with  nofe-gays  and  bunches  of  flowers  is  by  no 
means  a fafe  practice,  efpecially  in  clofe  rooms  or  fick 
chambers;  their  effluvia  are  of  fo  noxious  a nature  as 
quickly  to  render  the  air  unfit  for  the  purpofes  of  refpi- 
ration,  and  cannot  fail  of  having  bad  effects  upon  fick 
and  valetudinary  people  in  particular. 
But  it  is  alfo  evident,  that  the  odorous  parts  of  vege-  - 
tables,  when  feparated  by  art  from  the  putrefcent,  are  by- 
no  means  hurtful*  Hence,  except  in  particular  confti- 
tutions,  or  in  cafes  where  their  ftimulus  may  be  hurtful,  , 
they  may  be  fafely  ufed  as  agreeable  odours,  and  to  ob-  - 
viate  the  fmell  in  lick  rooms,  See.  The  volatile  alcali,  as 
Sir  john  pringle  obferves,  appears  in  this  view  perfectly 
innocent. 
What; 
