28 
In addition to the invaluable assistance which—as it is 
hoped—is clearly set forth in the above statement, the attempt 
to trace the African specimens which Burchell gave away or 
exchanged has been aided by many kind friends. Of the 
numerous specimens given to the British Museum, a large 
proportion has been found. Mr. G. J. Arrow and Mr. C. J. 
Gahan helped in the search for them among the Coleoptera, 
Mr. W. F. Kirby among the Orthoptera and Neuroptera, 
Mr. W. L. Distant among the Hemiptera, Col. C. T. Bingham 
among the Hymenoptera, Mr. E. E. Austen among the Diptera. 
Dr. David Sharp, F.R.S., gave the information that a few 
specimens given to Professor Henslow, and a larger number 
given to Mr. Swainson, are not to be found in the University 
Collections at Cambridge. Miss Sulivan similarly states that 
specimens given to the late Mr. Stephen Sulivan, of Fulham, 
are not to be found. 
It is impossible sufficiently to emphasize the amount of 
help received from Mr. Guy A. K. Marshall in the preparation 
of the African section of the work. His remarkable knowledge 
of Southern Ethiopian forms has enabled him to confirm many 
doubtful determinations and correct many errors in the identi- 
fications. Mr. Marshall was also able to detect mistakes made 
by Burchell ; but since his return to Africa he has made further 
inquiry and conducted further observations, finding- that in 
some cases Burchell was after all right in his statements. The 
result of the whole critical examination to which Burchell’s 
manuscript and the corresponding parts of his collections 
have been subjected, is to produce the profound conviction 
that he was the most accurate of observers, His errors were 
almost invariably due to a want of technical zoological know- 
ledge in some special branch, so that he often placed his 
Brazilian insects in wrong groups. But such mistakes are 
easily set right and do not impair the priceless value of his 
observations on habits and his trustworthy registration of 
dates and localities. There is a wide difference between 
Burchell’s African and Brazilian Notebooks as regards these 
technical mistakes. The much smaller African collection 
