130 
Ozone,  etc. 
f  Am.  Jour.  Pharm. 
\    Mar.  1, 1874. 
granular  crystals  of  formiate  of  zinc  on  the  covers  of  zinc  boxes  in 
which  oil  of  turpentine  had  been  kept,  and  Saussure  (Gm.  xiv.  247-8) 
found  that  in  nine  months  one  volume  of  oil  of  turpentine  can  take 
up  one  hur.dred  and  twenty-eight  volumes  of  oxygen. 
It  is  easy  to  see  that  the  action  of  the  turpentine  in  the  case 
brought  to  my  notice  was  simply  that  of  a  vehicle  which  conveyed  the 
oxygen  of  the  air  to  the  readily  oxidizable  metal. 
This  matter  lead  to  some  experiments  upon  the  action  of  acetic  acid 
and  turpentine  upon  tin,  viz.  :  three  pieces  of  pure  sheet  tin  were 
tweighed  and  immersed  respectively  in  glacial  acetic  acid,  an  acid  of 
SO  per  cent,  glacial  acid,  and  50  per  cent,  water,  and  in  oil  of  turpen- 
tine, reweighed  at  the  end  of  certain  periods,  and  the  loss  noted. 
With  Glacial  Acid. 
With  50 
per  cent.  Glacial  Acid. 
wt. 
Loss. 
Loss  p.  ct. 
Hrs. 
Wt. 
Loss. 
Loss  p.  ct.  Hrs. 
28  948 
30  209 
28  780 
•168 
•58 
24 
30  204 
•005 
•00017  24 
28-1435 
•6365 
221 
70 
30-191 
•013 
•0003  70 
27655 
•4885 
1  74 
96 
30  183 
•008 
•0002  96 
27545 
•110 
•39 
100 
: o  iso 
•003 
•0001  100 
27-537 
•008 
•0003 
104 
30173 
•007 
•0002  104 
27  100 
•437 
1-54 
118 
30163 
•010 
•0003  118 
In  turpentine,  40*024  grammes  of  sheet  tin  lost  only  *001  grm.  in 
118  hours. 
Laboratory,  49  Broad  Street,  Boston.  Jan.  2,  1874. 
— American  Chemist,  February,  1874. 
OZONE— A  NEW  AND  CORRECT  METHOD  OF  SUPPLY. 
The  use  of  ozone  as  a  disinfectant  in  hospital  wards  and  public 
buildings  has  amply  demonstrated  its  virtue  as  a  purifier  of  air  ex- 
hausted by  breathing  or  poisoned  with  emanations  from  corrupt  or 
decaying  organic  matter.  The  only  bar  to  its  more  extended  use  has 
been  the  lack  of  a  simple  and  trustworthy  means  of  generating  it, 
safely  and  continuously,  by  a  process  not  involving  scientific  skill  or 
costly  materials. 
The  latest  means  suggested  certainly  bears  the  palm  for  simplicity  ? 
cheapness,  and  accessibility  to  all.  It  consists  simply  in  the  exposure 
to  atmospheric  action  of  common  phosphorus  matches  moistened  by 
water,  the  alleged  result  being  the  production  of  nitrite  of  ammonia 
and  ozone — both  active  purifiers  of  air. 
Knowing  the  efficiency  of  moistened  phosphorus  as  a  generator  of 
