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 afield . But it is in the philosophical treatment of the subject as a whole , as well as in the cautions 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 organisms 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 itself. 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.
William Nowell , D.I.C. , Assistant Director of Agriculture , Trinidad and Tobago; Late Mycologist on the staff of the Imperial Department of Agriculture for the West Indies.