XX 
ADDENDA. 
of gold at Carapata, which yields 20 grains per ton, or 
somewhat less than a fifteenth hundredth part of the Cas- 
calhad or alluvial matter in which the gold is found. 
According to M. Brogniart [Mineralogie, torn. ii. p. 345.) 
the pyritical ores are sometimes worth working in Europe, 
which contain only^one two hundred thousandth part of 
gold. 
The following Observations have been added to the Note (Appendix, No. III.) 
containing the Correspondence between Mr. Park and Sir William Young. 
Several riicumslances have occurred since the publication of the former 
edition of this Work, which have induced the editor to re-consider very 
carefully the grounds of the opinions he h;)s exp'essed in the Biographical 
Memoir and in this Note, on the subject of Mr. Bryan L'Idwards's share in the 
composition of Park's Travels; and the result of the investig-ation has been 
to satisfy him that he was fully justified in those conclusions by the facts of 
the case. 
A natural prejudice has arisen on this subject, in the minds of some readers, 
from conceiving that what the Editor has stated in tins Note as liis deliberate 
opinion contradicts the assertions of Park in his correspondence with bir Wil- 
liam Young, and amounts to a direct impeachment of his veracity. But he is 
persuaded that this view of the case is hasty an<l erroneous; and that it will 
be found, on a due consideration of these If Iters, that iheie is no real contra- 
diction, nor indeed any inconsistencv or substantial difference, between the 
two statements. The opinion given in Park's Life was simply this; that 
without attempting to determine in what degree Mr. Edwards assisted in the 
composition of the Travels, it might safely be affirmed that the assistance 
afforded was considerable and insportant." These words could not be under- 
stood to imply that Mr. Edwards was the author of that publication; but were 
meant only to express an opinion (as ihe cunte.^t safficientiy siiews) that he 
revised the work throughout, that he corrected and polished the style, ex- 
punged or altered particular passages, and occasionally introduced observa- 
M .107 
