Am7u°i""iFo4arm'}  Pharmacy  and  Chemistry.  311 
The  silicate  resembles  broken  glass  fragments,  having  a  bright  sur- 
face and  of  a  greenish  to  brownish  color. 
Grove  &  Co.  and  Hill  &  Co.  have  a  case  showing  sulphur,  glycer- 
ine and  ammonium  carbonate.  The  ammonium  carbonate  is  a  very 
large  chunk,  and  the  separate  glass  receptacle  is  coated  with  a  fine 
sublimate. 
The  Brewer's  Supplies  are  represented  by  Collet  &  Co.  and  Ken- 
dall &  Sons  ;  these  exhibit  the  sulphites  such  as  the  magnesium  salt, 
butyric  and  valeric  acids,  the  beer  color  sucrosan,  etc. 
The  United  Alkali  Works  and  Bruner,  Mond  &  Co.  show  the 
alkali  for  which  they  are  noted ;  the  celebrated  Mond  nickel  goods 
are  also  here. 
Cordite  explosive  in  long  thin  sticks,  resembling  very  dark-colored 
Ceylon  cinnamon,  and  the  various  form  of  shell  used  with  this  explo- 
sive, make  an  interesting  case.  Picric  acid  is  one  of  the  constitu- 
ents of  this  terrible  explosive. 
That  England  is  still  on  the  map  so  far  as  the  manufacture  of 
artificial  dyes  from  coal  tar  is  concerned,  is  strikingly  shown  by  the 
Levinstein  Ltd.  exhibit.  These  people  have  books  of  colored  stuff, 
showing  the  value  of  dyes,  also  the  dyes.  A  few  bottles  of  Naph- 
thylamine  labeled,  4,000,000  pounds  annual  production,  nitro- 
naphthalin,  5,000,000  pounds,  and  other  bottles  with  similar  labels, 
are  shown.  As  these  products  are  only  used  as  starting  materials  for 
the  many  modern  fast  dyes,  an  idea  of  the  vast  production  is  implied. 
What  will  interest  the  pharmacist  the  most  are  the  utensils  used 
over  a  hundred  years  ago  by  pharmacists ,  old  oxymel  jars,  and  oil 
bottles  of  porcelain,  looking  more  or  less  like  tea-pots  or  squat  wine 
decanters,  quaint  iron  and  bronze  mortars,  the  various  helms,  retorts 
and  adapters,  reminding  one  of  old  alchemistic  prints,  etc.  Messrs. 
Corbyn  &  Stacey  have  brought  these  over. 
Penect  alum  crystals  in  large  regular  octahedrae,  as  made  by 
Peter  Spence  &  Son,  fill  two  large  cases.  Thallous,  ferric,  caesium, 
chromic,  rubidium,  sodium  and  potassium  alums  in  perfect  3-inch 
crystals  are  prominent.  Isomorphism  of  the  alums  is  finely  demon- 
strated by  growing  potassium  alum  over  chrom  alum,  and  vice 
versa,  also  iron  alum  over  potassium  alum.  In  Ostwald's  "  Inor- 
ganic Chemistry  "  it  is  stated  that  soda  alum  does  not  exist';  look- 
ing at  the  fine  soda  alums  shown  here,  one  is  convinced  of  the 
contrary. 
