30 
QUINOLOGY OP THE EAST INDIAN PLANTATIONS. 
5. The cells of the root-bark seem to have a peculiar aptitude for the formation of Cinchonine, 
agreeing in this respect with the cells of bark grown under dense shade. 
6. Cultivation of the fled Bark Tree for the sake of the roots would not answer as a commercial 
speculation, unless, from altered circumstances, Cinchonine were in greater demand than it is at present. 
Conclusion. 
In conclusion, I must resume some of the leading points, which appear to be shown with more or less 
clearness. 
1. That the cultivation of the Cinchona; in India promises complete success, but to ensure this, great 
attention must be paid to tbe choice of species. 
2. That if properly conducted it will prove remunerative. 
3. That Mr. MTvor’s plan of mossing is an important discovery in the direction of intelligent culture. 
4. That the renewal of the bark from the cambium leads to different conclusions as to the permanence 
of the supply of fresh bark, from those to be deduced from the theory of formation of the alkaloids in the 
leaves. 
5. That no part of the tree — root, stem, or leaves — visited by the ascending sap, seems to be the place 
of deposit of the alkaloids. 
6. That these are formed in the cellular tissue of the bark, beginning from the cambium outwards. 
7. That the sources whence the materials are drawn for this elaboration are at once the nourishing sap 
descending in its usual course, and a lateral conveyance, through the medullary rays, of part of the deposit 
of the mother-substance in the wood. 
8. That inasmuch as this mother-substance is characteristic of the Cinchonse, and is the source of the 
Cinchona-red, it may also mainly conduce to the formation of the alkaloids, since it is probable that the 
characteristic principle of each plant is originally one. 
9. That the above principle, deduced by M. Decaisne from his researches on Madder, is equally true as 
to Bed bark. 
10. That no explanation is at present offered of the tendency of the cells in the root of the Madder to 
secrete the peculiar colouring-matter, nor in the bark of the Cinchonse to produce alkaloid. 
11. That the electro-chemical properties of the cells are nevertheless greatly influenced by the respi- 
ration, and that by changing the character of this respiration we may artificially control their action. 
12. That the chlorophyllian respiration does not favour, but that the general respiration does favour the 
production of alkaloids. 
13. That the presence or absence of light has great influence (through the respiration) on all the above 
phenomena. 
14. That the laticiferous ducts dwindle and disappear coincidently with the formation of the alkaloids. 
15. That the liber fibres are not the place of deposit of the alkaloids. 
16. That in the liber the alkaloids are found in the state of the greatest purity, but in the outside cel- 
lular tissue these are more abundantly stored up ; especially this is the case as to Quinine. 
Tottenham, 1868. 
