IV 
PREFACE. 
of notes, Avhich always divide the attention of the reader, and weaken the 
interest of the subject. Many of the classes and orders have been reinves- 
tigated, and new species added. This is most extensively done in the 
departments which were intrusted to Mr. Blyth and Mr. Westwood ; hut 
it runs more or less throughout the whole ; and the publishers flatter them- 
selves that this will he of great service to all students of this highly in- 
teresting branch of knowledge. The style in which the book is brought 
out will speak for itself. The different sizes of type, which bear some pro- 
portion to the comparative importance of the subject, will enable the reader to 
glean an outline of the system; — to obtain something more than a bare 
outline, he must read the entire work, which in the present edition embodies 
all the discoveries of more recent naturalists, 
London, June, 1840, 
I 
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