I have aimed, therefore, in preparing these two volumes, to
combine them in such a manner as that they should form a whole. The
First Part contains an exposition of the general views I have
arrived at thus far, in my studies of Natural History. The Second
Part shows how I have attempted to apply these results to the
special study of Zoology, taking the order of Testudinata as an
example. I believe, that, in America, where turtles are everywhere
common, and greatly diversified, a student could not make a better
beginning than by a careful perusal of this part, specimens in hand,
with constant reference to the second chapter of the First Part. The
Third Part exemplifies the bearing of Embryology upon these general
questions, while it contains the fullest illustration of the
embryonic growth of the Testudinata."
The Preface closes with honorable mention of the gentlemen who have
furnished direct assistance in the preparation of the work, and
especially of Mr. Clark in microscopic observation and illustration,
and of Mr. Sonrel in drawing the zoological figures.
The LIST OF SUBSCRIBERS is not without its special meaning and
interest. If, as has been said, the grade of civilization in any
community can be estimated by the amount of sulphuric acid it
consumes, the extent to which a work like this has been called for
in different sections of the country may to some extent be
considered an index of its intellectual aspirations, if not of its
actual progress.
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