274       Recent  Literature  Relating  to  Pharmacy.  {Amju°ne;Sarm' 
The  majority  of  the  essential  oils  are  of  the  same  composition  but 
they  are  not  classed  with  the  gums  and  resins. 
SECTION  VIII.     MILKY  SAPS. 
(Not  included  in  above  sections.) 
Sub-section  i.  Rubber  Group. — These  consist  chiefly  of  hydro- 
carbons, known  as  polyterpenes. 
Examples :  Rubber,  gutta-percha,  balata  and  chicle. 
Sub-section.  2.  Opium  Group. — They  consist  chiefly  of  gum  and 
resin,  associated  with  alkaloids,  acids,  inorganic  salts,  etc. 
Examples  :  Opium,  lactucarium,  scammony  and  euphorbium. 
SECTION  IX.     INSPISSATED  SAPS  AND  EXTRACTS. 
Plant  exudations  or  inspissated  saps,  consisting  of  gum  or  resin, 
or  both,  associated  with  astringent  and  bitter  principles,  alkaloids, 
glucosides,  etc.;  or  inspissated  extracts  of  similar  composition. 
Sub-section  i.  Kino  Group. — These  are  plant  exudations  con- 
taining tannins. 
Examples:  Malabar,  Bengal  and  Australian  kinos,  West  Indian 
dragon's  blood  and  Mochras  or  silk-cotton  gum. 
Sub-section  2.  Hemp  Group. — A  plant  exudation,  containing 
resin,  inorganic  salts,  etc. 
Example  :  Charas. 
Sub-section  j.  Aloe  Group. — They  are  inspissated  saps,  contain- 
ing resin,  bitter  principles,  etc. 
Examples:  Barbadoes,  Socotrine,  Cape  and  other  kinds  of  aloes. 
Subsection  4.  Extract  Group. — This  includes  all  inspissated  ex- 
tracts containing  alkaloids,  glucosides  or  tannins. 
Examples :  Gambir,  cutch  or  catechu,  quebracho,  licorice  paste, 
curare,  etc. 
Philadelphia  Museums. 
RECENT  LITERATURE  RELATING  TO  PHARMACY. 
THE  ACTION  OF  AN  ACETYLENE  GAS-FLAME  ON  PLATINUM. 
Iltyd  J.  Redwood  devised  a  Bunsen  burner  to  use  with  acetylene 
gas.  After  applying  the  flame  to  a  platinum  crucible  a  short  time,  it 
was  discovered  that  the  vessel  had  gained  in  weight,  and  the  bottom 
very  much  resembled  newly  galvanized  iron.     The  crucible  was 
