Am.  Jour.  Pharm. 
Dec,  1S93. 
Effect  of  Noxious  Gases. 
567 
Result. — 2-5  per  cent.  CO  and  97-5  per  cent,  air,  revived  in  fresh 
air  after  5  minutes  inhalation  of  the  gas. 
No.  3.  I  placed  a  rabbit  in  a  glass  cylinder  and  pumped  in  an 
atmosphere  of  4  per  cent,  of  CO  and  96  per  cent,  of  air.  Death 
resulted  in  4^  minutes. 
Result. — 4  per  cent.  CO  and  96  per  cent,  air,  4^  minutes  inhala- 
tion ;  death. 
No.  4.  I  placed  a  mouse  in  a  glass  cylinder  and  pumped  in  an 
atmosphere  of  -2  of  1  per  cent,  of  CO.  At  the  end  of  6  minutes 
the  mouse  showed  no  signs  whatever  of  being  affected. 
No.  5.  Increased  the  atmosphere  to  -5  of  1  per  cent,  of  CO.  At 
the  end  of  5  minutes,  the  mouse  showed  no  signs  whatever  of  being 
affected. 
No.  6.  Increased  the  atmosphere  to  i-o  per  cent,  of  CO.  At  the 
end  of  30  minutes,  the  mouse  showed  no  signs  of  being  affected. 
Gave  it  then  fresh  air  to  revive  it  for  1  minute.  Increased  atmos- 
phere to  2-0  per  cent.  CO.  Mouse  died  in  10  minutes;  death 
accompanied  with  a  total  relaxation  of  all  the  muscles. 
Result. — 2  per  cent.  CO  and  98  per  cent,  air,  10  minutes  inhala- 
tion ;  death  (mouse). 
No.  7.  I  placed  a  mouse  in  an  atmosphere  of  2-5  per  cent,  of  CO 
and  97-5  per  cent,  air;  mouse  died  in  5  minutes. 
Result. — 2  5  per  cent.  CO  and  97-5  per  cent,  air,  5  minutes 
inhalation :  death  (mouse). 
No.  8.  I  placed  a  mouse  in  an  atmosphere  of  10  per  cent,  of  CO, 
90  per  cent,  air ;  death  resulted  in  3  minutes. 
Result. — 10  per  cent.  CO  and  90  per  cent,  air,  3  minutes  inhala- 
tion ;  death  (mouse). 
In  the  absence  of  the  missing  tests,  I  have  included  experiments 
4,  5,  6,  7  and  8,  simply  to  illustrate  the  fact  that  the  smaller  the 
animal  the  less  the  power  of  resistance  against  CO. 
SULPHURETED  HYDROGEN. 
I  note  again  the  results  obtained  by  scientific  authorities  whom 
we  are  accustomed  to  quote,  on  the  effect  of  Sulphureied  Hydrogen 
on  animal  life  ; 
Watts'  Dictionary  of  Chemistry,  p.  203,  says:    "An  atmosphere 
of  one-tenth  of  1  per  cent,  of  this  gas,  proves  fatal  to  lower  animals." 
Extract  from  Public  Health  Reports  and  Papers,  Vol.  Ill,  p.  75, 
