The book will be found of great value to the practical agriculturist as well as to the scientific investigator, who looks or should look, farther a field. But it is in the philosophical treatment of the subject as a whole, as well as in the cautious way in which the principles themselves are put forward, that the wider interest of the author’s work as a whole is to be attributed. As is well said in the text, “In every case of parasitism there are two organism to be considered, the host and the parasite. In a number of instances it is shown in the book how the incidence of a particular disease depends on external conditions, and the way is thus paved for a rational treatment of and infestation which depends upon a knowledge of what might be called the agricultural physiology of the plant it self. In this book at any rate a successful attempt has been made to grapple with the scientific principles of some of the larger issues that from the background of plant pathology.
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