ON A VARIETY OF CINCHONA BARK. 
179' 
dence in Peru, discovered that, in the interior, there, a 
similar and equally good quality of the calisaya bark [tree] 
of Bolivia was growing. The only difficulty being a perfect 
knowledge for the selection, which he possessing has dedi- 
cated himself to it, and selected these bales as samples, al- 
though a much larger quantity has been sent by him to 
England. 
" Should the result prove favourable, Dr. J. Villamil will 
extend his transactions in it, and will be willing to receive 
orders for purchases, which, however, we should be rather 
scrupulous to execute, fearful from its being a new article 
that it might come rather mixed in quality, as it appears 
that both genuine and spurious grow in the same soil and 
places. 
" However, you will be better able to judge from the re- 
sult of the seroons, regarding it ; and whether you should 
feel inclined to send orders for it through us; without, how- 
ever, our responsibility for quality. 
" We further add the certificate of an essay made in Lima 
showing the quantity of quinine it contains." 
[Certificated] 
"Lima, 8th October, 1846. 
Dr. Villamil : 
Dear Sir, — The Calisaya tabla bark which you are ex- 
tracting from the woods of Guanuco, in Peru, of which you 
have sent me a sample, in order to analyse it, I find pro- 
duced two and a half per cent, of sulphate of quinine, which 
1 assure you for the best of your interests. 
I am, dear sir, yours, &c. 
(Signed,) J. Jemy, Sr." 
A perusal of the above letter and certificate will induce 
the belief that the parties believed they had sent calisaya 
bark, which is corroborated by the testimony of the ana- 
