The narrowness of the field of consciousness, 217. Dis-
persed attention, 218. To how much can we attend at once?
219. The varieties of attention, 220. Voluntary attention, its
momentary character, 224. To keep our attention, an object
must change, 226. Genius and attention, 227. Attention's
physiological conditions, 228. The sense-organ must be
adapted, 229. The idea of the object must be aroused, 232
Pedagogic remarks, 236. Attention and free-will, 237.