BOOK REVIEWS, 



249 



and detrimental to plant health. This is an hypothesis difficult to 

 sustain, and the present little book is a sane and tolerant expose of 

 the fallacy contained in it. 



"Agricultural Chemistry." By H. Ingles, B.Sc.,F.I.C. Ed. 3. 

 8vo. vii -f 397 pp. (Scott, Greenwood, London, 1913.) js. 6d. net. 



First published in 1902, this excellent textbook has been thoroughly 

 revised and brought up to date, so that it will prove, as in the past, 

 an excellent handbook for students of agricultural chemistry. It is, 

 of course, not a book that anyone with no previous chemical knowledge 

 can read with advantage, but those who have had an elementary 

 course of chemistry will be able to use it to extend their knowledge 

 of the application of chemistry to agricultural problems of all kinds, 

 and will find it a thorough and reliable guide. A prominent feature 

 of the book is the large number of references to original papers which 

 it contains, enabling the student to follow up any particular point with 

 a minimum of trouble in routing out references. 



" The Perpetual Flowering Carnation." By Montagu C. Allwood. 

 8vo, 210 pp. (Cable Printing and Publishing Co., London, 1912.) 

 3s. net. 



This is a well got-up book, nicely printed, containing numerous 

 illustrations from photographs, of a particularly helpful nature, and 

 should prove especially valuable to large growers of perpetual flowering 

 carnations. 



The history of the plant has been fully dealt with, and the instruc- 

 tions as regards propagation and general culture are exhaustive and 

 very clearly laid down. Some exception will be taken by many 

 gardeners and amateur florists to the statement that the perpetual 

 carnation must eventually supersede the border varieties as summer 

 bedding plants. This can never be so as long as the latter retain 

 their great superiority in simplicity of culture and floral refinement, 

 though, of course, the perpetual variety can be employed to much 

 advantage where continuity of bloom is desired, and is essentially a 

 greenhouse flower. 



The author has devoted much pains to the details attending pro- 

 pagation and treatment immediately following, and his precise style, 

 especially while dealing with cultural hints, will be appreciated by 

 lovers of his favourite flower. A particularly interesting chapter is 

 devoted to the raising of new varieties, and a most useful book con- 

 cludes with an elaborate calendar of operations showing clearly the 

 work to be done month by month. 



" The Cotton Plant in Egypt : Studies in Physiology and Genetics." 

 By W. Lawrence Ball, M.A. 8vo, xvi + 202 pp., illus. (Macmillan, 

 London, 1912.) 5s. net. 



This volume forms the fifth instalment of the series of science 

 monographs which is now in course of publication, and, in accordance 



