Am.  Jour.  Pharru.  > 
October,  1898.  / 
Powdered  Vegetable  Drugs. 
519 
179.  Wheat  Flour. — Agglutinates  with  water,  distinction  from 
wheat  starch  ;  little  tissue  of  wheat  grain. 
180.  Middlings  of  Wheat. — Starch  and  numerous  fragments  of 
tissues  of  wheat. 
181.  Orris  Root. — Characteristic  starch  grains  15  x  15  to  15  x  30 
ji ;  scalariform  ducts  25  fi  wide  ;  no  cork. 
B.     SOLUBLE  OR  SWELL  IN  COLD  WATER  TO  FORM  A  STICKY  MASS. 
182.  Acacia  (white). — Soon  affected  by  water;  few  plant  tissues. 
183.  Tragacanth. — Slowly  affected  by  water;  fragments  of  ducts 
and  parenchyma  ;  more  likely  to  find  corn  starch  grains  in  com- 
mercial powder. 
B.    WITHOUT  STARCH. 
184.  (a)  Acicular  crystals. 
Squills. — Also  find  isoiated  fragments  of  fibro-vascular  tissue. 
II.    ABSENCE  OF  PLANT  TISSUES. 
A.  SOLUBLE  IN  WATER. 
185.  Cane  Sugar. — Characteristic  crystals;  soluble  also  in  mounts 
of  glycerin  and  glycerin  -J-  chloral ;  taste. 
186.  Potassii  Bitartras. — Soluble  in  water  with  acid  reaction;  with 
sodium  cobaltic  nitrite  solution  get  small  yellow  cubical  crystals, 
which  are  permanent  in  glycerin  mount. 
187.  Tartar  Emetic. — Large  irregular  masses;  add  HC1  to  the 
powder  on  a  slide,  and  then  pass  H2S  over  the  same,  get  an  orange- 
red  precipitate,  which  is  permanent  in  a  glycerin  mount. 
B.    INSOLUBLE  IN  WATER. 
(a)  Soluble  in  alcohol. 
188.  Camphor. — Liquefies  in  mounts  of  glycerin  and  chloral ; 
glycerin  mounts  show  irregular  masses. 
189.  Resina  Jalapce. — In  glycerin  get  irregular  opaque  fragments, 
which  swell  and  by  and  by  look  like  huge  amoeboid  masses ;  in 
glycerin  and  chloral  the  fragments  become  rounded,  transparent 
and  finally  dissolve. 
(U)  Insoluble  in  alcohol. 
a.  With  H2S04  reddish  color  after  some  time. 
190.  Saccharum  Lactis. — Small  and  large  irregular-shaped  crys- 
tals, insoluble  in  mounts  of  glycerin  or  glycerin  -f-  chloral. 
ft.  No  color  reaction  with  H2SO±. 
