160 FOREST CULTURE AND 



material.from this colony. The work should be ac- 

 cessible in this Museum to all interested in wood- 

 work. 



How much we have yet to learn of the value of our 

 forest products is instanced when we now know from 

 Spanish physicians to combat ague with Eucalyptus- 

 leaves, or when Count Maillard de Marafy, from ex- 

 periments instituted this year in Egypt, announced 

 to us that Eucalyptus-leaves can be used as a substi- 

 tute for Sumach. (Egypte Agricole, 1870. ) 



Already, in the earlier part of this lecture, I spoke 

 of the Peru Bark plants ; but the Cinchonas are not 

 all of the same kind. Some endure a lower degree 

 of temperature than others, some are richer in qui- 

 nine, others richer in cinchonine, others in quinoi- 

 dine ; and this again is much Subject to fluctuations 

 under different feffects of climate and soil. Great er- 

 rors may be committed, and have been committed, 

 by adopting from among a number of species the least 

 valuable, or one under ordinary circumstances almost 

 devoid of alkaloid, though a representative of the 

 genus cinchona, and not unlike the lucrative species. 

 When calculations in India prognosticate the almost 

 incredible annual return of one hundred and thirty 

 per cent., after four years, on the original outlay for 

 Cinchona plantation, it is supposed that the conditions 

 for this new industrial culture are to" the utmost favor- 

 able. That one of the best species did not thrive 

 there at all in proportion to expectations is owing, in 

 my opinion, to geologic conditions. The Cinchonas 

 before you, reared in soil from our Fern-tree gullies, 

 I intended to have tested for the percentage of their 

 alkaloids prior to this evening ; but the timely per- 



