THE PIvANT WORIvD 223 



the text on lectures, which are necessarily more general in scope. We 

 judge that the student of plant physiology will find in it many new sug- 

 gestions and much practical information. c. i.. p. 



Mosses with Hand Lens and Microscope. A Non-technical Hand- 

 book of the More Common Mosses of the Northeastern United States. 

 By A. /. Grotit, Ph. D. Part I, 4to, paper, pp. 1-86, with many illus- 

 trations. Published by the author. $1.00. 



Dr. Grout is to be congratulated upon the appearance of the initial 

 portion of this superbly printed work. It is intended as a manual of the 

 most popular type, by means of which anyone can learn to recognize the 

 more common of our mosses ; and it contains in convenient form prac- 

 tically all the information that the young student is apt to require. Among 

 the excellent features of the book we notice particularly the glossary of 

 bryological terms, with numerous text-figures to emphasize the defini- 

 tions ; also the pages dealing with the life history and structure of the 

 moss plant. The plates, of which there are a profusion, are beautifully 

 printed. Many of them are from the famous " Bryologia Europea." 



Interest in the forthcoming parts of this work will not be confined to 

 bryologists, and we trust it will take its place as one of the standard books 

 to which the adjective " popular" can be truthfully applied, c. L. p. 



Spraying Crops — Why, When and How. By Clarence M . Weed, D. Sc. 

 New York : Orange Judd Company. Illustrated, 150 pages, cloth. 

 Postpaid, 50 cents. 



The practice of spraying is now recognized as an essential part of 

 the work of the successful fruit-grower. Professor Weed's little manual 

 on " Spraying Crops " has been generally recognized, for the last ten 

 years, as a most useful guide to spraying operations, the book having 

 had an extraordinary sale in its three previous editions. The present 

 fourth edition has been rewritten and reset throughout to bring it thor- 

 oughly up to date, so that it embodies the latest practical information 

 gleaned by our fruit growers and experiment station workers. 



After an introduction which discusses the general principles involved 

 in spraying, the book is divided into four parts, the first dealing with 

 spraying the larger fruits ; the second with spraying small fruits and 

 nursery stock ; the third with spraying shade trees, ornamental plants 

 and flowers ; and the fourth with spraying vegetables, field crops, and 

 domestic animals. In each part the principal insect and fungous enemies 

 of the various crops are discussed, and the best methods of combating 

 them are clearly described. j. r. T. 



