2-94 



THE QUARTERLY REVIEW OF BIOLOGY 



A HANDBOOK OF THE BIRDS OF 



EASTERN CHINA (Chihli, Shantung, 

 Kiangsu, Anhwei,^ Kiangsi, Chekiang, Foh- 

 kien, and Kwangtung Provinces). Part IV 

 (Containing Families Ploceida, Fringillidce, 

 Bombycillida, and Hirundinida). 

 By J- T>. D. La Louche. Taylor and Francis 

 7S. 6d. London 



61 x 9; 106 + 5 plates (paper) 

 Taxonomic, with notes on seasonal 

 and geographic distribution, and, to a 

 smaller extent, on habits. 



interesting results. But the type of result 

 obtained may be indicated by the fact that 

 in the case of Helianthus, with concen- 

 trated illumination with white light on 

 one side, the intensity of illumination is 

 4.6 times greater on the lighted than on 

 the shaded side. There is selective 

 absorption for different regions of the 

 spectrum, being § for blue light if that 

 for red light be taken as 1 . 



BOTANY 



UNTERSUCHUNGEN UBER DIE 

 LICHTVERTEILUNG IN AVENA-KOL- 

 EOPTILEN UND ANDEREN PHOTO- 

 TROPISCH REIZBAREN PFLANZEN- 

 ORGANEN BEI EINSEITIGER BE- 

 LEUCHTUNG. 



Botanische Abhandlungen, Heft 12. 

 By Erich Nuemhergk. Gustav Fischer 



19 marks Jena 



6| x 9I; i6z + 12. plates (paper) 

 A contribution to plant physiology of 

 the first importance. The author has 

 devised a method of measuring with 

 physical precision the penetration of light 

 into plant tissue. The principle of the 

 method is that the cross-section (or 

 longitudinal section) of an organ illumin- 

 ated from a certain direction is photo- 

 graphed at right angles to this direction, 

 and the photograph so obtained is sub- 

 sequently photometrically registered and 

 measured. Experiments were conducted 

 with five forms that have been much used 

 in studies of phototropism, namely the 

 hypocotyls of Helianthus and of Panicum 

 maliaceum, the hypocotyl and coleoptile 

 of Setaria italica, the coleoptile of Avena, 

 and the root tip of Sinapis alba. Space 

 is not available to summarize all the 



PLANT HUNTING 



By Ernest H. Wilson. The Stratford Co. 



$15-00 6JX9I Boston 



Vol. I, xxix + Z48 (paper) 



Vol. II, ix + tj6 (paper) 



The author of these beautifully printed 



and superbly illustrated volumes is keeper 



of the Arnold Arboretum of Harvard 



University. He starts by saying that 



between 1899 and 191.2. he "wandered 



about the world in search of plants." 



What an altogether delightful occupation! 



In these volumes I have attempted to give some 

 account of the lands visited, of their discovery, 

 their vegetation, and to tell in a general way also of 

 the work done by early plant hunters. All parts 

 of the world have added to the common store of 

 garden material, but the countries sketched are 

 among the richest sources of supply. Such a task as 

 here attempted must, of course, be discursive since 

 finality is obviously impossible. I have merely 

 lifted a corner of the curtain so as to allow a peep at 

 the general scene. 



The result is a charming book, full of 

 extraordinary interest, not only to the 

 botanist but also to the general reader. 

 The illustrations, of which there are 12.8 

 are a great feature of the work. They are 

 mostly photographs of trees and the 

 landscapes in which they occur. But they 

 are superb photographs, of rare and 

 beautiful trees. No gentleman's library 

 should lack this book. 



