'•}  Sterculia  Gum.  27 
D  issimilarities —  Qualitative. 
Sterculia. 
Tragacanth. 
7.  In  cold  water. 
8.  Boiling  in  dilute  al- 
kali. 
9.  Caustic  soda  and 
warming. 
10.  Boiling  in  dilute  acid. 
11.  Alcohol  added  to  li 
quid  formed  in  (10). 
«.  Colorless. 
b.  Granular  jelly. 
c.  Adhesiveness  absent 
or  very  small. 
Insoluble. 
No  change  of  color. 
Soluble,  forming  arabin 
.  [J.  H.  M.] 
Whitish  precipitate.  (See 
fuller  statement.) 
a.  Opalescent. 
b.  Smooth  viscid  mass. 
c.  Adhesive. 
Almost  entirely  dissolves. 
Canary-yellow  color 
which  fades  on  cooling. 
Soluble,  forming  pectin 
[Giraud]. 
Formation  of  floating  glai- 
ry mass. 
Quantitative. 
Sterculia. 
Tragacanth. 
12.  Specific  gravity. 
13.  Soluble  gum. 
14.  Insoluble  gum. 
15.  Starch. 
16.  Ash. 
S.  urens,  1*49. 
S.  diversifolia,  1*472. 
Arabin  (chiefly). 
S.  urens,  3*14  p".  c. 
S.  diversifolia,  9  88  p.  c. 
S.  rupestris,  6*9  p.  c. 
Para^rabm. 
S.  rupestris,  63*42  p.  c. 
S.  diversifolia,  61*74  p.  c. 
S.  urens,  75*1  p.  c 
None. 
S.  rupestri*,  9*0  p.  c. 
S.  diversifolia,  8*195  p.  c. 
S.  urens,  1  5*83  p.  c. 
S.  tragacantha,  7*8  p.  c. 
[Fluckiger]. 
1  The  author  finds  5*46 
p.  c.  of  ash  in  Cochlos- 
permum  Gossypium. 
1*384  [Watts'  "Diet,  and 
Encyc.  Britt."). 
"A  mixture  of  different 
bodies,  and  not  a  defi- 
nite principle,  like  ara- 
bin. 
8-10°  per  cent.  [Giraud]. 
7*7  p.  c  [J.H.  M.]. 
"  Pectic  compound." 
60  p.  c.  [Giraud]. 
2-  3  p.  c.  [Giraud]. 
3  p.  c.  [Giraud]. 
3-  24  p.  c.  (mean  of  some 
experiments  by  J.  H. 
M.) 
The  author  believes  in  the 
general  accuracy  of  Gi- 
raud's  figures,  but  the 
difficulties  of  making  an 
accurate  determination 
are  enormous.    This  ex- 
plains the  fact  that  no 
two  observers  obtain  the 
same  figures. 
Most  Indian  specimens  of  &  urens  smell  a  little  of  acetic  acid  ;  trag- 
acanth never  does,  as  far  as  the  author's  experience  goes. 
The  author  is  responsible  for  all  the  results  in  which  names  arc 
not  given  in  brackets. 
