300 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



NOTES AND ABSTRACTS, 



Abies magnifica (Bot. Mag. tab. 8552).— N.-W. United States. 

 Nat. Ord. Coniferae, Tribe Abietineae. Tree 250 feet high. Crown 

 round-topped, trunk 10 feet thick, almost devoid of branches to the 

 middle, bark long remaining a silvery white. Leaves f-ij inch 

 long, persisting for ten seasons. Female cones (ripe) oblong-cylindric, 

 6-9 inches long, 2j— 3J inches wide, tawny-purple to blackish. — G. H. 



Acacia x * H. C. White.' By W. T. {Card. Chron. April 18, 

 1914, p. 262 ; 4 figs.). — Agreement with the assumption that the 

 parents are A. dealhata and A. Baileyana. — E. A. B. 



Actinidia chinensis {Bot. Mag. tab. 8538). — China. Nat. Ord. 

 Ternstroemiaceae, Tribe Sauraujeae. Shrub, climbing. Leaves, 

 dimorphic, on sterile twigs elliptic, on floral twigs suborbicular, 

 2i-5 inches long. Flowers i-sexual, orange-yellow, 2 inches across. 

 Stamens very many. — G. H. 



Agricultural Schools, The Danish People's High Schools and 

 (Jour. Bd. Agr. vol. xxi. No. 3, pp. 227-234). — The nature and 

 scope of these institutions are described. — A. S. 



Air, Castor«oil Plant, and Laboratory. By E. M. Harvey 

 [Bot, Gaz. Nov. 1913, pp. 439-442). — Ricinus communis was found 

 to be quite extraordinarily sensitive to impurities in the atmosphere. 

 A very small amount, -00001 per cent., of ethylene produced a definite 

 response, and one part in a million produced drooping of petioles or 

 folding down of laminas. It is probably ethylene which produces 

 similar results in sweet pea seedlings. 



The castor-oil plant should prove extremely useful as a detective 

 of ethylene in laboratories and greenhouses. — G. F. S. E. 



Aleyrodidae, Classification of. By A. L. Quaintance and A. C. 

 Baker {U.S.A. Dep. Agr., Bur. Entom., Tech. Ser. 27, pt. i. March 1913 ; 

 34 pis.). — ^This paper deals with certain features of the anatomy and 

 external structure of the Aleyrodidae, and shows the position of the 

 family among homopterous insects. 



All species of the family at present known are treated, save those 

 belonging to Aleyrodes, and this genus will be made the subject of a 

 later publication. — V. G. J. 



