98 
Red  Bark. 
/Am.  Jour.  Pharm. 
I      Feb.,  1885. 
secure  as  near  as  possible  bark  of  each  sort  of  the  same  age.  Yet  it 
will  be  understood  that,  even  among  trees  of  similar  size,  one  tree  from 
any  particular  circumstance  may  develop  slightly  thicker  bark  in  the 
same  space  of  time  than  another  which  may  be  growing  under  more 
modified  conditions.  The  trees  selected  were  growing  at  the  same 
general  elevation.    The  special  objects  in  view  were : 
1st.  To  compare  the  yield  of  the  Pata  with  the  "  tile bark. 
2d.  To  place  these  two  sorts  against  "  crown." 
3d.  To  observe  the  increase  of  alkaloid  which  takes  place  as  the 
bark  grows  older. 
To  the  obliging  kindness  of  David  Howard,  Esq.,  F.  C.  S.,  I  am 
entirely  indebted  for  tlie  examination  of  the  samples,  a  copy  of  which 
is  annexed. 
Analysis  of  samples  referred  to 
by  D.  Howard,  Esq.,  F.  C.  S. 
True  "red  bark,"  C.  succirubra,  Teja, 
or  "tile"  variety  of  South  Ameri- 
can bark  collectors,  one  year  old 
renewed  bark  
True  "red  bark,"  C.succirubra,  "tile" 
variety,  two  years  old  renewed 
bark  
True  "red  bark,"  C.  succirubra,  Pata  l 
variety,  one  year  old  renewed  bark  j 
True  "  red  bark,"  C.  succirubra,  Pata  \ 
variety,  two  years  old  renewed  ' 
bark  
"Crown,"  one  year  old  renewed  [ 
bark  
three  years  old  renewed 
"Crown,"  four  years  old  renewed  j 
bark  
"Crown,"  apparently  original  bark,  j 
Tree  twelve  years  old  
Root  bark  from  large  primary  roots  ' 
of  true  C.  succirubra,  Pata  tree,  20 
feet  high.  
"Crown,"  a  variety  with  small  \ 
leaves,  the  Paramo  bark  of  Loxa  : 
collectors,  three  years  old  renewed  I 
bark  
Quinine  sul- 
phate, per 
cent. 
Quinine  alka- 
loid, per  ct. 
Cinchonine 
alkaloid, per 
cent. 
Cinchonidine 
alkaloid,per 
cent. 
!    Quinidine  al-  | 
:      kaloid,  per 
;  cent. 
5-32= 
i 
4-00 
1-42 
0-66 
0-14 
4-40= 
3-30 
trace 
0-23 
0-06 
5-68= 
4-26 
trace 
0-08 
0  08 
5-82= 
4-37 
ti'ace 
0-32 
0-17 
2  -60= 
1-95 
trace 
trace 
0-18 
i  3-10= 
2-33 
0-17 
0-06 
0-17 
1  7-64= 
5-23 
0-38 
0-18 
0-66 
i 
1  8-80- 
6-60 
trace 
0-12 
0-37 
i 
12-30= 
9-22 
0-00 
0-12 
0  64 
i  4-68= 
3-51 
2-10 
2-26 
0-77 
6-28= 
4-69 
103 
0-48 
0-34 
I  beg  to  direct  attentioL  to  the  small  proportion  of  the  inferior 
