Note 27 — Chapter III · Mathematics and Nature Study
Alexis Frederick Lange translation
McLellan & Dewey, “The Psychology of Number,” International Education Series, D. Appleton & Co., New York, 1895.
[28] Speer, W. W., “The New Arithmetic,” Ginn & Co., Boston, 1896.
[29] Smith, David Eugene, “The Teaching of Elementary Mathematics,” Ch. V, The Macmillan Co., New York, 1900.
[30] Eckoff, William J., “Herbart’s A, B, C, of Sense Perception,” International Education Series, D. Appleton & Co., New York, 1896.