PREEACE 
Tue fourth volume of Hope Reports contains a large 
number of papers published in the period 1900-1903. 
The Annual Reports of the Hope Professor, published in 
the University Gazette, indicate that the study of African 
species and of African bionomics is pursued with especial 
energy in the Department, and by those who are in con- 
tinual correspondence with it, especially Mr. Guy A. K. 
Marshall. It so happened that several memoirs on these 
subjects were published in the year 1902, and as they 
were sufficient to make up a volume by themselves, No. III 
of the Hope Reports, dealing with African natural history, 
was issued early in 1903. Hence the years 1900-1903 
have furnished material for two volumes of these Reports. 
Papers 2 to 12 deal with insect bionomics and other 
questions relating to evolution and natural. selection in 
this group of animals. The first paper, on ‘Mimicry and 
Natural Selection, is a reprint of the English address to 
the International Zoological Congress at Berlin on Aug. 15, 
1901. Mr. N. Annandale’s work (3) upon the material 
collected in the Malay Peninsula was largely carried on in 
the Hope Department. Mr. Shelford’s important memoir 
(4) on Bornean mimicry was written in Sarawak, but 
nearly all the specimens were sent to the Hope Depart- 
ment for study and identification, and many additions to 
