470 
Boiled  Linseed  Oil. 
Am.  Jour.  Pharm. 
Sept.,  1390. 
kino.  Ether  agitated  with  the  filtrate  took  up  •  1 5  per  cent,  of  which 
one-third  was  estimated  to  be  catechin,  and  the  rest  resin. 
Mr.  Kirton  has  recorded  liquid  kino  from  the  Illawarra  district  of 
New  South  Wales,  but  since  there  appears  to  be  no  reason  why  it 
should  be  found  in  one  colony  more  than  another,  it  will  doubtless 
also  be  obtainable  in  Victoria,  most  likely  on  application  to  fisher- 
men. 
ON  BOILED  LINSEED  OIL. 
By  Frank  H.  Thorp,  S.B. 
The  author  has  published  in  the  Scientific  American  the  details  of 
a  large  number  of  experiments  on  the  preparation  of  boiled  linseed 
oil  with  the  agency  of  the  oxides  and  various  salts  of  lead,  zinc 
and  manganese,  and  his  results  are  summarized  in  the  following : 
CONCLUSIONS. 
Lead  driers  always  give  the  oil  a  deep  color,  which  shows  more 
or  less  in  the  film. 
Zinc  driers  do  not  appear  to  act  on  the  oil  to  any  great  degree,  as 
oils  thus  prepared  dry  slowly  and  do  not  give  very  hard  films. 
Manganese  driers  give  the  best  results  in  all  respects.  Litharge 
gives  the  best  results  of  the  lead  driers,  the  oil  being  quick  drying 
and  the  film  hard,  and,  if  not  overheated,  the  oil  is  but  moderately 
colored.  Of  the  zinc  salts,  the  acetate  seemed  to  give  the  best 
results,  although  the  borate  and  citrate  were  nearly  as  good.  The 
borate  and  acetate  of  manganese  gave  the  best  results  obtained. 
The  acetate  requires  careful  use,  for,  if  heated  much  above  2300,  it 
gives  a  deep  color  to  the  oil,  owing  apparently  to  the  formation  of 
tar.  The  borate  undoubtedly  gives  the  best  boiled  oil  for  all  pur- 
poses. 
The  oxalate  is  difficult  to  decompose,  or  at  least  has  little  or  no 
action  on  the  oil  until  a  very  high  temperature  is  reached.  In  two 
experiments  the  quantities  of  borate  and  oxalate  used  and  the  tem- 
perature of  each  were  nearly  the  same,  but  the  borate  gave  a  good 
oil,  while  the  oxalate  did  not. 
The  chloride,  nitrates  and  sulphates  do  not  make  good  driers. 
The  first  two  have  too  violent  an  action  on  the  oil,  while  the  last 
are  very  difficult  to  decompose,  requiring  a  high  temperature. 
There,  appears  to  be  no  advantage  in  the  use  of  formates,  citrates, 
