Am.  Jour.  Pharm. 
Oct.  1,  1872. 
}  Gleanings  from  the  European  Journals.  451 
/Hi 
Cantharidin  volatilizes  with  the  vapors  of  chloroform  at  60°C 
Distilled  with  water,  the  first  portions  contain  the  largest  proportion 
of  cantharidin.  The  aqueous  distillate  of  cantharides  contains  be- 
sides cantharidin  an  animal  oil  of  low  boiling  point,  which  decreases 
with  the  age  of  the  insects. — Ibid.  32-34. 
Preservation  of  pencil  and  India  ink  drawings. — L.  Erckmann 
pours  upon  the  paper  placed  upon  a  glass  plate  or  smooth  board,  suf- 
ficient collodion  containing  2  per  cent,  of  stearin.  When  dry  the 
paper  may  be  washed  off  with  water,  without  affecting  the  drawing. — 
Ibid.  52. 
The  removal  of  ink  spots  from  colored  fabrics  is  best  effected  by  a 
concentrated  solution  of  pyrophosphate  of  sodium,  which  dissolves 
the  ink  slowly  without  affecting  the  color. — Ibid,  from  Polyt.  Notizbl. 
A  blowpipe  worked  by  water  is  described  in  Zeitschr.  f.  anal. 
Chem.,  the  construction  of  which 
is  readily  seen  in  the  accompanying 
cut.  The  pipe  A  is  connected  with 
a  hydrant  or  reservoir  containing 
water,  the  flow  of  which  is  regulated 
by  the  stopcock.  Running  into  the 
bottle  E  of  the  capacity  of  about  a 
litre,  air  is  drawn  through  the  short 
side  branch  B  ;  the  water  and  air 
separate  again  in  the  bottle,  the  air 
escaping  under  pressure  through  c, 
to  which,  by  means  of  India  rubber 
tubing,  a  blowpipe  is  attached.  The 
surplus  water  is  carried  off  by  the 
syphon  D,  and  its  flow  is  regulated  so 
as  to  retain  the  water  in  the  bottle 
at  a  uniform  height.  The  pressure  may  be  readily  increased  by 
lengthening  the  pipe  A. 
The  conversion  of  pyrophosphates  into  phosphates  may,  according  to 
Prinvault,  be  effected  by  acids.  If  sulphuric  is  used,  the  cause  of  the 
transformation  is  the  production  of  an  alkaline  phosphosulphate  ; 
under  the  influence  of  boric  acid,  a  phosphoborate  is  formed. — Journ. 
de  Pharm.  oVAnvers,  1872,  July,  318. 
Production  of  cymen  from  oil  of  turpentine. — Barrier  treats,  at 
