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The author, an experimental animal psychologist and professor of psychobiology in Cornell University, is well known for his work with the Pavlovian conditioned reflex method and its improvements. The emotional hazards discussed are experimentally induced emotional difficulties. Liddell regrets that Pavlov introduced the term “experimental neurosis” because it led to many misunderstandings. All the term actually means is “a definite and chronic emotional disorder.” This book is a monograph in the series of American Lectures in Objective Psychiatry, edited by another leading conditioned reflex expert, William H. Gantt. It is an excellent introduction to the scientific techniques of causing emotional disorders by curtailing the animal's freedom of movement intermittently and subjecting it, during the state of seriously restricted motility, to painful physical stimulation which the animal can learn to avoid by making correct logical inferences and acting according to them at the appropriate time. The monograph contains many examples which illustrate the main ideas and procedures very well. The author speaks from long and intensive experience and thinking. His experiments and those of others have demonstrated adequately that a number of definite life situations cause chronic emotional disorders making the animals (pigs, goats, sheep) “neurotic.” It is presumed that similar causes produce similar psychological results in man but the problems of man are by far more diversified and complicated because of man's much more complicated reasoning powers and much more diversified ways of emotional expression and gratification. Therefore, the problem of neurosis in man cannot be entirely demonstrated and solved by experiments on animals. The author quotes Nolan Lewis and some others whose ideas helped to understand the empirical observations and to advance experimentation. In an “addendum”, Frances Prochazka offers a number of observations on the training of horses. The monograph