Chapter XIII: The Conditions of Learning

We shall consider in this chapter the influence of time of day, size of class, and amount of time devoted to arithmetic in the school program, the hygiene of the eyes in arithmetical work, the use of concrete objects, and the use of sounds, sights, and thoughts as situations and of speech and writing and thought as responses.[17]

[17] Facts concerning the conditions of learning in general will
be found in the author's _Educational Psychology_, Vol. 2,