This first in a new naturalist series is perhaps not technical enough to interest the trained and experienced ichthyologist, but is still too technical for the average fisherman. It therefore seems directed to the angler who approaches the sport in a scientific spirit, or to the layman with a budding interest in the science of fish. A thorough and informed study of fish, their structure, habits, sensory, perception, how they live, etc. Which seems to be for the purpose of giving the angler a more thorough knowledge of his prey with helpful hints as to how he can make practical use of the material presented. The breeding, development and growth, the feeding and digestive processes, vision, hearing, balance, smell, taste, touch, locomotion, blood, breathing, nervous system, migration, and typical reactions to different types of stimuli are completely covered. While different types of fish are taken into consideration, their variations mentioned, this is not a handbook for recognition- and should be sold as a naturalist's book first, an angler's book second.