Am.  J.  Ph.] 
7 
[Nov.,  1886 
JANENTZKY  &  WEBER, 
Manufacturers  and  Importers  of 
ARTISTS'  MATERIALS. 
J.  &  W.'s  Superfine  Artists'  Oil  Colors,  in  Collapsible  Tubes. 
J.  *W.'s  Artists' Prepared  Canvas,  Academy  Boards,  Oil  Sketching  Paper  and  Brushes,  Papier  Mache' Plaques, 
Paint  Boses,  Mathematical  Instruments,  Drawing  and  Painting  Studies,  Eepousse'  Tools  and 
Tapestry  Materials,  Paper  and  Was  Flower  Materials. 
ENGINEERS'  and  DRAUGHTSMEN'S  SUPPLIES. 
Manufacturers  of  FINE  LITHOGRAPHIC  COLORS  and  PRINTING  INKS,  _ 
and  the  CELEBRATED  ANGLO-SWISS  VERMILION. 
No.'  1125  Chestnut  St.,  Philadelphia. 
ESTABLISHED  1822. 
ROSENGARTEN  &  SONS, 
MANUFACTURING  CHEMISTS, 
PHILADELPHIA. 
Silver  Medal  Awarded  by  Franklin  Institute,  Nov.,  1874, 
FOR  PURITY  OF  CHEMICAL  PREPARATIONS. 
Sulphate  of  Morphine. 
Sulphate  of  Quinine. 
Muriate  of  Quinine, 
Citrate  of  Iron  and  Quinine, 
Sulphate  of  Cinchonine, 
Sulphate  of  Cinchonidine, 
Sulphate  of  Quinidine, 
Bromide  of  Ammonium, 
Bromide  of  Potassium, 
Nitrate  of  Silver, 
Acetate  of  Morphine, 
Muriate  of  Morphine, 
Nitrate  of  Ammonia, 
Hypophosphites, 
Subnitrate  of  Bismuth, 
Spirits  of  Nitre, 
C.  P,  Acids, 
Tannin, 
AND  A  GENERAL  ASSORTMENT  OF  FINE  CHEMICALS. 
Extract  from  Report  of  the  Judges  at  the  Exhibition  of  the  Franklin  Institute,  Philadelphia 
November,  1874,  in  regard  to  Chemicals  exhibited  by  Rosengarten  &  Sons. 
"  These  gentlemen  exhibit  quite  a  list  of  Chemicals,  and  claim  for  them  superior  purity 
considered  as  commercial  articles.  The  Committee  have  carefully  examined  a  number  of 
them  and  find  this  claim  fully  substantiated,  some  of  the  articles,  being  almost  absolutely 
Chemically  Pure,  and  being  certainly  the  best  of  the  kind  in  the  market. 
"  For  Purity  of  Chemical  Preparations,  a  Silver  Medal." 
F.  A.  GENTH,  Prof.  Chemistry  University  Pa. 
G.  A.  KOENIG,  Prof.  Chemistry  University  Pa. 
S.  P.  SADTLER,  Prof.  Chemistry  University  Pa. 
J.  E.  CARTER,  Manufacturing  Chemist. 
