This book deals with one of the fundamental problems in the fields of biology and medicine, i. e., the problem of adaptation of an organism to its environment. Essentially, adaptive responses enable animals and man to perform new tasks imposed by the environment and also to achieve timely avoidance of damage from environmental factors. Such are the roles of the defense response, adaptational reactions to high altitude and maximal loads, immunogenetic responses, etc. The author rightly views adaptive responses of the organism as reactions involving natural prophylaxis of disease, although...