12 
was a comparatively simple matter to make an exact copy of 
the notebooks. But it very soon became clear that such 
a volume would lose nearly all its value if the specimens 
referred to in the notes were not found, determined, and when 
new described. Burchell’s African Catalogue is a complete 
account of the corresponding collection, and at first it was 
thought sufficient to determine the South African species and 
print the Brazilian manuscript as it stood. The latter only 
provides a complete record of his captures at the very begin- 
ning of the South American journey—between July 26 and 
Oct. 27, 1825. Beyond this latter date the notebook con- 
tains records (brought into relation with the specimens by 
numbers) “of such Insects o7/y as require special and particular 
remark’’—a very small proportion of the whole collection. 
However, these “special and particular” remarks are of the 
deepest interest to the naturalist, and it was soon realized 
that the specimens must, as far as possible, be recovered and 
determined. It was therefore decided to add the name of the 
species, wherever possible, to the observations, accompanied 
by reference numbers; but to print in their present form, 
without addition, those Brazilian notes referring to locality 
only. These are indicated by dates and not numbers. To 
find the corresponding specimens would be an immense 
labour ; for the vast bulk of the American collection is labelled 
with dates, and only a small proportion with numbers. 
And the gain would not be commensurate. To collect 
together, for example, the varied assortment of insects 
captured by Burchell, at Rio, on New Year's Eve, 1825, 
during an “ Excursion to the summit of the Corcovado; from 
Catete and up the Valley of Laranjeiros,” would be a pro- 
longed and difficult task. Moreover, as the collection is 
gradually worked out and published in separate memoirs 
these facts will emerge, and can easily be separated and 
brought out in a concluding paper. Hence, while admitting 
the interest and importance of collecting together these 
assemblages of forms observed on a single day and under 
the same conditions, it was thought better not to defer the 
