Hunter, _Laboratory Problems in Civic Biology_. American
Book Company.
Beebe, _The Bird_. Henry Holt and Company.
Bigelow, _Applied Biology_. Macmillan and Company.
Davison, _Practical Zoology_. American Book Company.
Herrick, _Household Insects and Methods of Control_. Cornell
Reading Courses.
Hornaday, _Our Vanishing Wild Life_. New York Zoological
Society.
Hodge, _Nature Study and Life_. Ginn and Company.
Kipling, _Captains Courageous_. Charles Scribner's Sons.
Sharpe, _Laboratory Manual_, pp. 157-158, 182-203, 320-341.
American Book Company.
Stone and Cram, _American Animals_. Doubleday, Page and
Company.
Toothaker, _Commercial Raw Materials_. Ginn and Company.