ELEMENTARY

Hunter, _Laboratory Problems in Civic Biology_. American

Book Company.

Bigelow, _Introduction to Biology_. The Macmillan Company.

Cornell _Nature Study Leaflets_. Bulletins XVI, XVII.

Davison, _Practical Zoology_, pages 185-199. American Book

Company.

Hodge, _Nature Study and Life_, Chaps. XVI, XVII. Ginn and

Company.

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Company.

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