[7] This list comprises some of the books that have been helpful to me. It is not intended to be complete. Good new books are constantly appearing. The teacher should endeavor to keep up with the new books.
[8] Teachers' Leaflet, No. 14: Cornell Nature-Study Bulletin, June, 1899.
[9] Home Nature-Study Course, December, 1903.
[10] Nature-Study Quarterly, No. 2: Leaflet 15.
[11] Nature-Study Quarterly, No. 2: Leaflet 15, October, 1899.
[12] Nature-Study Quarterly, No. 5: Leaflet 18. June, 1900.
[13] Nature-Study Quarterly, No. 5: Leaflet 18, June, 1900.
[14] These and other forms found in still or slow flowing water are described and pictured in Leaflet No. XII, Life in an Aquarium.
[15] Figures 52, 53 and 54 are adapted from Dr. R. Leuckart's Zoological Charts.
[16] Teachers' Leaflet No. 11. May, 1898.