A Plant Physiology

Abstract

of galls. This chapter closes with a brief but interesting discussion of the galls formed on animals. The work is a most comprehensive presentation of the modern aspects of the general subject of cecidology. The galls themselves are the subjects of primary consideration and the gall makers secondary. The entire subject is treated from the standpoint of the botanist, and galls are grouped with reference to their own characters and not the characters of their makers. Questions of taxonomy and alternation of generations are referred to only incidentally, but these subjects are well treated in other works on cecidology which are accessible to all energetic workers. The great bulk of the work is compiled from the writings of the Germans and French, who have been the most active investigators in this field. The author might well have given a little more attention, however, to the Italian, English, and American contributions. The work is timely and will find a welcome in every modern laboratory of general botany and plant pathology. In fact, it will be indispensable for those who expect to gain a broad and thorough knowledge of modern plant pathology.MEL. T. COOK. A plant physiology