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BY WHICH THE PARTS OF THE LIVING ENGINE ARE SUPPLIED
WITH THE MATERIALS NECESSARY FOR THEIR MAINTENANCE
AND GROWTH
CHAPTER III.
THE PHYSIOLOGY OF THE COMMON CRAYFISH. THE MECHANISM
BY WHICH THE LIVING ORGANISM ADJUSTS ITSELF TO SUR-
ROUNDING CONDITIONS AND REPRODUCES ITSELF
CHAPTER IV.
THE MORPHOLOGY OF THE COMMON CRAYFISH. THE STRUCTURE
AND THE DEVELOPMENT OF THE INDIVIDUAL
PAGE
xi
46
87
137
CHAPTER V.
THE COMPARATIVE MORPHOLOGY OF THE CRAYFISH. THE STRUC-
TURE AND THE DEVELOPMENT OF THE CRAYFISH COMPARED
WITH THOSE OF OTHER LIVING BEINGS
227
CHAPTER VI.
THE DISTRIBUTION AND THE ETIOLOGY OF THE CRAYFISHES. 288
LIST OF WOODCUTS.
Frontispiece.
THE COMMON CRAYFISH, Astacus fluviatilis, (MALE) FIG. 1. Astacus fluviatilis. SIDE VIEW OF THE MALE.
6
xiii
FIG. 45. Astacus fluviatilis. THE FIRST AND SECOND MAXILLI-