HENRY HOLT & CO. 34 West 33d Street, N. Y. 378 Wabash Ave., Chicago Transcriber's Notes Illustrations have been moved near the relevant section of the text. Inconsistent use of spacing has been retained for page numbers followed by "f" or "ff", and for "i.e." / "i. e.", "e.g." / "e. g.", and "c.f." / "c. f." Inconsistent use of commas following "i.e.", "e.g.", and "c.f." has also been retained. Inconsistent use of single and double quotes around words and the placing of punctuation either within or external to quotes has been left as-is. Capitalization inconsistencies and grammatical errors relating to subject/verb agreement were also retained. Inconsistent hyphenation, accents, and use of separate words have been retained for "any one" / "anyone", "arm movement" / "arm-movement", "backstep" / "back-step", "blind spot" / "blind-spot", "by the way" / "by-the-way", "counting machine" / "counting-machine", "divining rod" / "divining-rod", "ear movements" / "ear-movements", "eye movement(s)" / "eye-movement(s)", "eyebrows" / "eye-brows", "first rank" / "first-rank", "four fifths" / "four-fifths", "Hans problem" / "Hans-problem", "head jerk" / "head-jerk", "head movement(s)" / "head-movement(s)", "hoped for" / "hoped-for", "memory images" / "memory-images", "movement impulse" / "movement-impulse", "movement responses" / "movement-responses", "number concepts" / "number-concepts", "number terms" / "number-terms", "psychophysical" / "psycho-physical", "some one" / "someone", "sound waves" / "sound-waves", "thought processes" / "thought-processes", "tieraugen" / "tier-augen", "time measurements" / "time-measurements", "training process" / "training-process", "vaudeville stage" / "vaudeville-stage", "well disposed" / "well-disposed", "well known" / "well-known", "well trained" / "well-trained" "zoologist" / "zooelogist", "Zoological" / "Zooelogical". There is no direct reference to Table of Reference item 105 or 112 within this book. Here is a list of the minor typographical corrections made: