222 BOTANICAL GAZETTE [ocTOBER 
families of plants named in the literature. This is in addition to the general 
index for the volume as a whole.—R. B. WYLIE 
Chemistry of vegetable cell 
A valuable service has been rendered to students of plant physiology by 
conditions in Europe. This does not mean that the text is already old, for the 
delay has permitted a revision since the war, and much new material has been 
incorporated, particularly that which has been the result of discoveries in the 
laboratories of Europe. Any failure to note foreign results is excused by GRAFE 
on the grounds of the great difficulty vs tocar in keeping in touch with the 
scientific production of other nations. 
The subject is presented under five main headings: the physicochemical 
laws of cell phenomena; light and heat as energy factors; the cell wall; the 
protoplasm; and dynamic chemistry. The first two sections occupy about a 
fourth of the text, and survey the problems of diffusion and osmosis, colloidal 
state, imbibition, adsorption, electrolytic dissociation, energy transformations, 
and catalysis. The third section is the briefest one, and deals with the struc- 
ture, composition, and chemical transformations and modifications which occur 
in the walls of cells during development and maturation. 
The section on protoplasm considers its colloidal structure, chemical 
constitution, the enzymes, toxins, precipitins, and pigments of the cell, par- 
rl 
brief consideration of stimulus and response, closing with the constructive 
energy-storing processes. 
The book is intended as a general text for students, and the author has 
written in a style that is commendable for its clarity and directness. The 
literature list at the end of the volume occupies twenty double column pages, 
and the total number of references is nearly a thousand. Some of these refer- 
ences are not considered in the text of the volume, but are included for those 
who desire to orient themselves with reference to the literature on cell chem- 
istry.—Cuas. A. SHULL. 
Poisonous plants 
A textbook dealing with the poisonous plants and weed seeds of Canada 
and the Northern United States has been prepared by Tomson and SIFTON. 
2 GRAFE, a Chemie der Pflanzenzelle. 8vo. pp. viii+-420. figs. 32. Berlin: 
Borntraeger. 1922 
3 THOMSON, R. B., and Srrton, H. B., A guide to the poisonous plants and weed 
seeds of Canada and the northern United States. 8vo. pp. 169. figs. go. dercba 
of Toronto Press. 1922. 
