CHAPTER 6. STRUCTURE OF THE HEART IN EDRIOPHTHALMA.
CHAPTER 7. DEVELOPMENTAL HISTORY OF PODOPHTHALMA.
CHAPTER 8. DEVELOPMENTAL HISTORY OF EDRIOPHTHALMA.
CHAPTER 9. DEVELOPMENTAL HISTORY OF ENTOMOSTRACA,
CIRRIPEDES, AND RHIZOCEPHALA.
CHAPTER 10. ON THE PRINCIPLES OF CLASSIFICATION.
CHAPTER 11. ON THE PROGRESS OF EVOLUTION.
CHAPTER 12. PROGRESS OF EVOLUTION IN CRUSTACEA.
HISTORY OF CRUSTACEA.
CHAPTER 1. INTRODUCTORY.
When I had read Charles Darwin's book 'On the Origin of Species,' it
seemed to me that there was one mode, and that perhaps the most certain,
of testing the correctness of the views developed in it, namely, to
attempt apply them as specially as possible to some particular group of
animals. such an attempt to establish a genealogical tree, whether for
the families of a class, the genera of a large family, or for the
species of an extensive genus, and to produce pictures as complete and
intelligible as possible of the common ancestors of the various smaller
and larger circles, might furnish a result in three different ways.
1. In the first place, Darwin's suppositions when thus applied might
lead to irreconcilable and contradictory conclusions, from which the
erroneousness of the suppositions might be inferred. If Darwin's
opinions are false, it was to be expected that contradictions would
accompany their detailed application at every step, and that these, by
their cumulative force, would entirely destroy the suppositions from
which they proceeded, even though the deductions derived from each
particular case might possess little of the unconditional nature of
mathematical proof.
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