space, 55, 66, 89, 235, 256 absolute, 85, 93 amorphous, 417 Bolyai, 56 Euclidean, 65 geometric, 66 Lobachevski's, 239 motor, 69 non-Euclidean, 55, 235, 237 of four dimensions, 78 perceptual, 66, 69 tactile, 68, 264 visual, 67, 252 spectra, 316 spectroscope, 294 Spencer, 9 sponge, 219 Stallo, 10 stars, 292 statistical mechanics, 304 straight, 62, 82, 236, 433, 450, 470 Stratonoff, 531 surfaces, 58 systematic errors, 171 tactile space, 68, 264 Tait, 98
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