314 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



not only ah (which is not the same as ha) but h. This is not in accord 

 with the views of Mendel. So also (a x h) x c yielded other 

 descendants besides ac, be, and ahc, such, e.g., as the form a X h. This 

 survival of the mother-hybrid is common enough, more usual than 

 that of father or mother in binary crosses. 



Also C. salvifolius X (C. populifolius X C. salvifolius) gave : 

 (i) Intermediates with predominance of hybrid father ; (2) inter- 

 mediates between the two parents ; (3) plants approaching but 

 not identical with C. salvifolius ; (4) plants scarcely distinct from 

 C. salvifolius. 



In very few cases does there seem to have been any distinct and 

 definite isolation of one of the parent sub-species. Microscopic exami- 

 nation showed, in by far the most examples, characters such as form or 

 arrangement of hairs, colour of flower &c., which belonged or in part 

 belonged to one or other parent. — G. F. S. E. 



Citropsis, an African Genus Allied to Citrus. By W. I. 



Swingle and M. Kellerman [Jour. Agr. Research, i. pp. 4194-36, Feb. 

 1914 ; figs.). — ^A new genus is formed to contain the African ' cherry 

 oranges,' Citropsis Schweinjurthii {=Limonia Schweinjurthii, L. 

 ugandensis, and L. Poggii) being the type, the other species included 

 being C. Preusii Preusii), C. gahunensis {=L. gahunensis, L. 



Lacourtiana ?). C. mirahilis {=L. mirahilis), C. articulata (=Citrus 

 articulata). It is suggested that some of these species might be use- 

 fully employed in hybridizing, and that they may be readily grafted on 

 species of Citrus, tabog (Chaetospermum glutinosa), and the wood-apple 

 {Feronia elephantum). — F. J. C. 



Citrus White Fly, Report of a Trip to India and the Orient 

 in search of the Natural Enemies of the. By R. S. Woglum 

 {U.S.A. Dep. Agr., Bur. Entom., Bull. 120, Feb. 1913 ; 12 plates, 

 2 figs.). — This bulletin has been prepared with the idea of presenting 

 some of the more important phases, from a scientific point of view, of 

 a journey made in search of parasitic and predatory enemies of the 

 citrus white fly [Aleyrodes citri R. & H.). The result of the trip was 

 to bring to light two hitherto unknown specimens of natural enemy 

 (viz. the larvae of a coccinelhd, identified by Mr. E. A. Schwarz as 

 Cryptognatha flavescens Motch) and an internal parasite of the white 

 fly identified by Dr. Howard as belonging to the genus Prospatella, 

 of the hymenopterous subfamily Aphelininae. — V. G. J. 



Clinostat Researches and Statoliths. By Ferdinand Dawers 

 {Beih. Bot. Cent. xxxi. Abt. i. Heft 3, pp. 309-357; with 8 figures). — 

 The experiments detailed in this paper were carried out with Piccard's 

 apparatus, and refer to the localization of geotropic sensitiveness in 

 roots and seedhng stems. When opposite stimuli are applied to the 

 root tip and base of Lupinus alhus seedhngs, it is the tip which prevails. 

 Helianthus proved unsuitable. 



The internode of various grass seedlings was found to be sensitive 



