Am.  Jour.  Pharm.") 
February,  1897.  J 
Terpin  Hydrate. 
UTERATURE  NOT  IN  THE  BODY  OF  THE  ARTICLE. 
1888,  B.  Hintz,  "Zur  quantitativen  Bestimmung  von  Acetoti  in  Methyl- 
alcohol,  Holzgeist  und  Aceton,"  Ztschr.  anal.  Chem.,  37,  182. 
1890,  Fr.  Collischonn,  "Ueber  die  gebrauchlichen  Methoden  zur  quantita- 
tiven Bestimmung  des  Acetons,"  Ztschr.  anal.  Chem.,  29,562. 
1890,  H.  Huburt,  "Zur  quantitativen  Bestimmung  des  Acetons  im  Harn," 
Ztschr.  anal.  Chem.,  29,  632,  from  Neubauer  und  Vogel ;  "  Anleitung  zur 
Analyse  des  Harns,"  9  Auf.,  471. 
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methylenes  de  d£naturation,"  Comp.  rend.,  110,  534. 
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110,  642  ;  Ztschr.  anal.  Chem.,  37,  695. 
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Erkrankung  en  des  Magens ;"  Berliner  klin.  Wochenschrift,  No.  33  ;  und 
Matys  Jahresberichte  uber  die  Fortschritte  der  Thierchemie,  24,  352  ;  1896, 
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des  Acetons,"  Ztschr.  anal.  Chem.,  35,  503. 
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305  Cherry  Street,  Philadelphia,  Pa. 
TERPIN  HYDRATE. 
By  Edward  T.  Hahn. 
In  1840,  A.  Wiggers  contributed  an  article  to  the  Annalen  der 
Chemie,  33,  358,  on  the  crystalline  substance  from  turpentine  oil,  to 
which,  however,  he  applied  the  name  turpentine  camphor.  He  em- 
ployed a  mixture  of  nitric  acid,  alcohol  and  turpentine  oil,  and  in 
18461  {Annalen  der  Chemie,  57,  247)  reported  a  formula  for  making 
the  substance  on  a  large  scale,  stating  that  it  could  only  be  obtained 
from  that  variety  of  turpentine  which  yielded  a  crystalline  com- 
pound with  hydrochloric  acid. 
The  method  suggested  by  Wiggers  was  tried  with  commercial 
oil  of  turpentine,  but  it  failed  to  produce  any  crystalline  compound. 
Knowing  that  the  oil  of  turpentine  found  on  the  market  at  the  pre- 
sent time  is  occasionally  adulterated  with  some  of  the  heavier 
petroleum  oils,  a  quantity  of  the  commercial  oil  was  procured  and 
distilled  with  lime  and  water.    An  oil  having  a  specific  gravity  of 
1  Am.  Jour.  Pharm.,  12,  286. 
