53P 



NATURE 



[January 14, 191 5 



trees, dwarf trees and shrubs, trees and shrubs 

 with handsome fruits, handsome-barked trees and 

 shrubs, variegated and coloured trees and shrubs, 

 fine-foliaged trees and shrubs, autumnal colour 

 in trees and shrubs, early- and late-flowering 

 trees and shrubs, street planting, hedges, trees 

 and shrubs for w^et places, shrubs for dry positions 

 and poor soils, shrubs for shady places, and trees 

 and shrubs for the seaside. 



All the necessary general information upon 

 each subject is given in a clear and concise 

 manner, but special details of culture required by 

 individual plants are given later in the descriptive 

 part of the work. The early part of the book 

 will appeal specially to the purely practical man, 

 but the more important part, which commences 

 at page 113 of vol. i., and is continued to the 

 end of the second volume, will be found to be 

 of value to everyone who is interested in hardy 

 ligneous plants, whether from the point of view 

 of the botanist, student, landowner, gardener, or 

 forester. Descriptions are given of all the species 

 of trees and shrubs, so far identified, which are 

 of any importance in the British Isles, with many 

 of the most distinct botanical varieties, and in 

 almost every case the descriptions have been 

 prepared from living plants in the Kew collec- 

 tions. The arrangement of genera and species 

 is, as far as possible, alphabetical, this arrange- 

 ment only being altered where two species are 

 very closely allied, and the distinguishing features 

 can be more clearly defined when the descrip- 

 tions run concurrently. An ample index of some 

 forty pages, however, atones for this little 

 digression. 



One system of description obtains throughout 

 the work. The name of each genus appears in 

 large capitals with the order to which it belongs 

 in small capitals. Then follows a general 

 description of the genus with distribution and 

 special cultural directions. The principal species 

 are then described, each description being headed 

 by the scientific and common names, and, when 

 necessary, the chief synonyms, together with an 

 indication as to where a good botanical drawing 

 of the plant can be found. The following descrip- 

 tion gives an idea of the general style of the 

 work : — 



L. TRAGOPHVLLA, Hemslcy. Chinese Woodbine. 

 (Bot. Mag., t. 8064.) 



A deciduous climbing shrub, with smooth young 

 shoots. Leaves oval, tapering about equally to both 

 ends ; 2 to 45 ins. long, J to 2 ins. wide ; slightly 

 glaucous above, glaucous and slightly downy beneath. 

 The uppermost pair of leaves are wholly united by 

 their bases, forming a diamond shape ; the next pair 

 lower down are less united, but still clasp the stem ; 



NO. 2359, VOL. 94] 



still lower down come short-stalked leaves. Flowers 

 bright yellow, produced in a terminal head of ten to 

 twenty.' Corolla-tube 2\ to 3^ ins. long, slenderly 

 cylindrical, smooth outside, downy within ; across the 

 t\vo lips the corolla measures i in. or more in width. 

 Berries red. 



Native of the province of Hupeh, China; discovered 

 by Henry and introduced for Messrs. Veitch by Wil- 

 son in 1900. It flowered for the first time at Coombe 

 Wood, in July, 1904. L. Caprifolium is closely 

 related, but differs in its whorled flowers and in the 

 smooth interior of the corolla-tube. L. tragophylla 

 is the largest flowered and most showy of the true 

 honeysuckle (Periclymenum) group. It likes a deep 

 moist loam, and Mr. W'ilson recommends for it a 

 semi-shaded position. 



It will thus be seen that the descriptions are 

 clear, concise, and ample for all practical purposes. 

 Botanical terms have been avoided whenever 

 possible, but in such a work they could not be 

 excluded, and for the benefit of readers who are 

 unfamiliar with such terms an excellent glossary 

 precedes the commencement of part ii. 



Mr. Bean's intimate connection with the Kew 

 collections for upwards of a quarter of a century, 

 coupled with his keen powers of observation and 

 critical knowledge of everything connected with 

 hardy ligneous plants, offer a sufficient guarantee 

 for the thorough trustworthiness of the book, and 

 it should find a place in the library of every lover 

 of trees and shrubs, whilst nurserymen and others 

 would do good work, and indirectly pay a graceful 

 compliment to the author, by adopting it as the 

 national standard of nomenclature. 



The publisher has done his share in a manner 

 worthy of the firm, and Mr. E. J. W'allis and 

 Miss E. Goldring are to be complimented upon 

 the photographs and drawings. Both author and 

 publisher are to be congratulated upon the pro- 

 duction of a book which is likely to be the standard 

 work upon trees and shrubs for at least half a 

 centurv. W. Dallimore. 



FIRST PRINCIPLES OF MATHEMATICS. 

 Neue Grimdlagen der Logik, Arithmetik iind 



Mengenlehre. By Julius Konig. Pp. viii + 259. 



(Leipzig: Veit and Co., 1914.) Price 8 marks. 



THIS is an interesting and very readable book 

 which, with a comparatively small amount 

 of new notation, discusses the elements of the 

 theory of sets. The most original section is that 

 on "logical forms"; this is a theory of induction 

 more or less corresponding to Whitehead and 

 Russell's theory of types, and axioms of reduci- 

 bility. The most controversial chapter is that on 

 Zermelo's axiom, and the principle of selection; 

 here the author is very ingenious, but, we fear, not 

 very convincing. Given a class (a, h, c, . . .) he 

 treats the term "a or b or c or . . .", that is (nearly) 



