14 
ME. J. BEOTJ GHTQN’S CHEMICAL AND PHYSIOLOGICAL 
Table (continued). 
Alkaloids, 
per cent. 
Ash, 
per cent. 
Liber of mossed red bark 
M arch 
1868 
9-80 
3-03 
External bark of ditto — 
>5 
55 
11-83 
1-80 
Liber of red bark 
99 
55 
o-94 
2-60 
External bark of ditto 
55 
99 
7-89 
2-01 
Liber 5|- years old 
April 
59 
7-10 
3-10 
External bark of ditto 
55 
59 
8-00 
2-38 
Bark renewed naturally 
March 
55 
5-30 
3-27 
Bark shielded with tin plate 
May 
55 
7-60 
2-38 
Mean specimen of red bark 
59 
59 
7-43 
2-90 
Bark from Darjeeling 
55 
99 
6-85 
2-70 
Prize red bark 
September 
55 
8-10 
2-10 
Mossed ditto 
59 
55 
5-40 
1-92 
Bark from east of Neilgherries 
59 
59 
6-89 
2-17 
Other Barks. 
C. officinalis 
May 
GO 
O') 
3-7 2 
8-77 
55 
55 
4-28 
4-49 
5) 
July 
55 
3-84 
4-21 
5) 
September 
3-10 
3-06 
„ at 5500 ft. 
95 
2-68 
2-90 
March 
1868 
3-22 
2-52 
59 
2-64 
2-97 
,, grown in shade 
September 1869 
3-40 
3-89 
59 
55 
95 
6-96 
3-17 
5? * * 
55 
95 
3-77 
4-17 
55 
1867 
7-51 
3-00 
C. Pahudiana 
May 
0-13 
4-34 
„ nitida 
59 
55 
5-90 
2-14 
„ unknown name 
59 
59 
3-96 
4-58 
,, peruviana 
55 
59 
6-16 
2-77 
Leaves of C. succirubra 
0-019 
5-74 
Wood .. ,, 
0-10 
0-89 
Bark of willow-trunk 
0 
4-47 
„ ,, branch 
0 
5-37 
,, Cupressus lusitanica, trunk 
0 
2-78 
,, ,, branch 
0 
7-72 
„ ffliodomyrtus, trunk 
0 
3-99 
, ,, branches 
0 
5-19 
var. “ lanceolata trunk-bark 
5-60 
4-54 
' V 
11-40 
3-34 
95 99 59 59 
11-70 
2-62 
The hypothesis mentioned above is not borne out by the numbers in the preceding 
Table. 
The nature of the soil on which the trees were grown is throughout the whole very 
similar. As the great disturbance which might be supposed to occur from variations in 
the composition of the soil does not take place to any considerable extent under the con- 
ditions of the experiment, it is difficult to perceive any cause that can obscure the con- 
sequences of the hypothesis, supposing it to be true. But in order to test it still further, 
the bases in the ash were separately determined in a few cases in which the divergence 
was most marked, and the numbers obtained were compared with the amount of alka- 
