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The biology of the amphibia. Amphibians. THE MODE OF LIFE HISTORY 65 were described as respiratory structures but histological examina- tion has shown that they are merely folds of the body
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Boys and girls in biology : or, Simple studies of the lower forms of life. Biology. THE LOBSTER. 149 water, and one side of this sac is pushed inward to form
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Boys and girls in biology : or, Simple studies of the lower forms of life. Biology. THE GREEN PLANT. 31 the yeast-cell (Fig. 21); it has a woody or cellulose sac,
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