piration current flows through it and the leaves transpire rapidly. 

 The tracheidal structure of the wood more probably provides the 

 conifer with a safety mechanism that is a defence against extinction. 

 3. Conifers are more easily deranged and killed by sudden 

 injuries, and are attacked by a larger number of serious fungal 

 and insect foes, than are dicotylous trees. To their greater vul- 

 nerability and smaller powers of repairing injuries we may at least 

 partially attribute the defeat and extinction of many Conifers in 

 past ages. " 



H. CLINTON-BAKER. Illustrations of Conifers. (Hertford, 1909, 

 vol. i, pp. 75, pis 68). E. S. R., Feb., 1910. Washington. 



This work consists of a series of life-size illustrations of the 

 cones and foliage of conifers growing in the British Isles supple- 

 mented by analytical keys of the species and by short and concise 

 descriptions of each tree represented. 



DAVID STEWART. Suggested use of " Abies nobilis " for plant- 

 ing up blanks in old and in young woods. Trans, of the 

 R. Scottish Ar boric. Society, Vol. XXIII, Part I, January 1910. 

 Edinburgh. 



Though this tree cannot be recommended for general planting, 

 the author thinks that it is one of the' most suitable for filling up 

 blanks that may occur in plantations, whether old or young. It is 

 a good shade bearer, and, once established, it is a very rapid 

 grower. 



It is liable to suffer from frost in the earlier stages of growth ; 

 but if used for the purpose suggested, it would be protected by 

 the surrounding crop. 



One advantage gained by using Abies nobilis is that it does not 

 need protection against rabbits. 



F. J. PHILLIPS. A study of Pinon Pine. (Bot. Gaz., 48, 1909, 

 n. 3, pp. 216-223). E. S. R., XXI, Dec.. 1909. 



A brief discussion of the pinon pine (Pinus edulis] relative to 

 its general distribution, local occurrence, tolerance and form, wood, 

 fruit, reproduction, and future management. 



