ji i.v i, i88r.] 
THE TROPICAL AGRICULTURIST. 
101 
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Quinine 
Cinchonidine 
Quiuidino- 
Cinchoniue 
Amorphous alkaloid ... | 
1 
1 
It will be seen that there ie a remarkable agreement 
,n these renew ed barks. No. '2 alone shows a differ- 
ence, which cannot be explained. But if this tree is 
left out of the reckoning there is very little difference 
in the results of the four remaining analyses, although 
the yield of the original bark varied greatly, so that 
it appears that in thin renewing, at the beginning at 
least, a bark of very uniform composition is formed, 
aa regards the alkaloid yield. The formation of so 
much cinchoniue in this young tissue is also peculiar — 
a peculiarity which is also noticed in renewed succi- 
rubra bark. No. 2 cannot owe its hi«;h quinine- 
yield to tho moss-covering, else the same influence 
would have operated in 4 aud 5. The cutting off 
tho bark in shavings from the living tree was, as an 
experiment, also tried ou officinalis and eucoi rubra 
trees. The nualv&es of these barks are given under 
117 and 90 and 91. Tho examination of renewed 
sucoirnbira bark was also continued, and no diminu- 
tion was observed in the yield of quinine, which 
mther increases steadily. The renewed bark, No. 8f>, 
which was 26 months old, is certainly of very great 
value. The renewed bark of some other varieties of 
cinchona gave no remarkably good results. In the 
following table are placed side by side the analyses 
of tho original, original mossed, ami two-year renewed 
bark of the same breei 
26 
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Composition. 
Quinine 
Cinchonidine 
Quinidine 
Ciochonino 
Amorphous alkaloid ... 
Total 
In succimbru there ia usually some quinidine fomned 
in the renewed bark, but specially disti ct in the 
formation of a larjjo quantity of quinine and the 
diminution of a croat deal of the cinchonidine, wl ile 'hf 
