236 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



would, in my opinion, have made his book much more valuable 

 to those having charge of estate woodlands, if he had had 

 expert assistance in preparing it. The book is well got up, 

 printed in clean type, and has been carefully edited. 



J. F. A. 



Webster's Foresters' Diary atid Pocket Book for 1 9 11 . London : 

 William Rider & Son. Price 2s. 6d. 

 This useful little annual has been brought up to date, and is 

 well worth the price at which it is offered. 



Sur U7ie theorie nouvelle de la captation de V azote atmospherique 

 par les plantes Par E. Henry. 



This small pamphlet contains a paper published by Prof. 

 Henry, in the "Annales de la Science agronomique frangaise 

 et etrangere" for 1909, on a new theory of the fixation of 

 atmospheric nitrogen by plants. The new theory which forms 

 the subject of the paper, was published by Mr Jameson in the 

 Journals issued by the Agricultural Research Association, 

 Aberdeen, for the years 1905 and 1906 respectively. Prof. 

 Henry commences his paper with a brief but interesting 

 historical sketch of the work already done on nitrogen fixation. 

 He then proceeds to subject the facts put forward by Mr 

 Jameson to a critical examination, and comes to the con- 

 clusion that Mr Jameson has not established the ground upon 

 which his theory is based. The assimilation of nitrogen by 

 plants is a question of absorbing interest and importance, and 

 as Prof. Henry discusses the subject from the point of view 

 of forest trees and agricultural crops respectively, his paper 

 forms instructive reading to the student of both forestry and 

 agriculture. R. A. Berry. 



Syon House Trees and Shrubs. 38 + viii. pp. By A. Bruce 

 Jackson. West, Newman & Co., 19 10. 



This is a catalogue of hardy trees and shrubs growing in the 

 grounds of Syon House, Brentford, the Middlesex seat of the 

 Duke of Northumberland. An alphabetical arrangement has 

 been adopted. The systematic name, with the authority for it, 



