_Reference books._--Throughout the preceding chapters exact references have been made to various books, as many of which as possible should be in the school-library. Some of these references have been made with special regard to the teacher, but most with special regard to the pupil. All of the books referred to are included in the following list. For the convenience of the prospective buyer, the names of the publishers and prices of the books are appended. In buying books, it is of course not necessary to order from the various publishers. A list of the books desired may be handed to any book-dealer, who will order them and who should in most cases be able to get them for a little less than publisher's list prices. =Baskett, J. N.= The Story of the Birds. 1899, D. Appleton & Co. $0.65. =Beddard, Frank.= Animal Coloration. 1892, Macmillan Co. $3.50. ---- Zoogeography. 1895, Macmillan Co. $1.60. =Bendire, Chas.= Directions for Collecting, Preparing, and Preserving Birds' Eggs and Nests. Distributed by U. S. National Museum. =Bird Lore=, an Illustrated Journal about Birds. Macmillan Co. $1.00 a year. =Cambridge Natural History=, Vols. V (Peripatus), $4.00, VI (Insects), $3.50. Macmillan Co. =Chapman, Frank.= Handbook of the Birds of Eastern North America. 1899. D. Appleton & Co. $3.00. =Comstock, J. H.= Manual for the Study of Insects. 1897, Comstock Publishing Co. $3.75. ---- Insect Life. 1901, D. Appleton & Co. $1.50. ---- =and Kellogg, V. L.= Elements of Insect Anatomy. 1901, Comstock Publishing Co. $1.00. =Cooke, W. W.= Bird Migration in the Mississippi Valley. Distributed by the Division of Biological Survey, U. S. Dept. Agric. =Cowan, T. W.= Natural History of the Honey-bee. 1890, London: Houlston. 1s. 6d. =Coues, Elliott.= Key to North American Birds. 1890, Estes and Lauriat. $7.50. =Darwin, Chas.= The Formation of Vegetable Mold through the action of Worms. D. Appleton & Co. $1.50. ---- Origin of Species. 1896, Caldwell. $0.75. ---- The Structure and Distribution of Coral Reefs. D. Appleton & Co. $2.00. ---- Plants and Animals under Domestication. D. Appleton & Co. =Davie, Oliver.= Methods in the Art of Taxidermy. 1894, Oliver Davie & Co., Columbus, O. $10 net. =Gage, S. H.= Life History of the Toad. Teacher's Leaflets No. 9, April, 1898, prepared by College of Agriculture, Cornell University, Ithaca, N. Y. =Heilprin, A.= The Distribution of Animals. 1886, D. Appleton & Co. $2.00. =Hodge, C. F.= The Common Toad. Nature Study Leaflet, Biology Series No. 1. 1898, published by C. H. Hodge, Worcester, Mass. =Holland, W. J.= The Butterfly Book. 1899, Doubleday and McClure Co. $3.00. =Hornaday, W. T.= Taxidermy and Zoological Collecting. 1897, Chas. Scribner's Sons. $2.50 net.