NOTES AND ABSTRACTS. 



669 



Sequoia sempepvipens in Alg'epia. By Dr. Trabut {Rev. Hort. 

 d'Alg. p. 78; March. 1912). — About fifty years ago M. de Lannoy, 

 Eesident Engineer, did some experimental planting at Djebel Onach, 

 and as a result the colony now possesses some fine specimens of 

 Sequoia sempervirens. It seems, therefore, that this tree might well 

 be employed in the re -afforestation of this part of Algeria. — M. L. H. 



Silvep-Leaf (Dep Milchglanz dep Obstbaume). By H. T. 



Giissow (Zeitschr. f. Pflanzenkr. xxii. p. 385; 1912; figs.). — A descrip- 

 tion of the too well-known silver-leaf disease which attacks most of 

 our fruit trees and many forest trees and is now also recorded from 

 Canada. He ascribes the disease to the fungus Stereum purpureum, 

 and gives an account of the experiments which have proved this fungus 

 to be the cause. The figures show the lesions produced in the affected 

 plants and the fungus mycelium in the wood, and its fruits. — F. J. G. 



Soil, Fungous Flopa of. By C. N. Jensen (U.S.A. Exp. Stn., 

 Cornell, Bull. 315; June 1912; many figures). — A discussion of the 

 fungi occurring in the soil, with descriptions of the species found by 

 various workers, and notes upon their relation to- diseases, &c. 



F. J. C. 



Soils of the Ppaipie Regions of Alabama and Mississippi, and 



theiP Use fOP Alfalfa. By H. H. Bennett and M. A . Crosby 

 (U.S.A. Dep. Agr., Bur. Soils and PI. Ind., Rep. 96; Dec. 1911; 

 6 plates, 4 figs.). — In these regions there are extensive areas o^f a 

 dark-coloured upland calcareous clay soil, known as Houston clay, 

 which is particularly well adapted to the cultivation of alfalfa. The 

 natural productiveness of the soil is shown by the fact that much of 

 this land after seventy-five years or more of practically continuous 

 cultivation to cotton and corn without the addition oi any kind of 

 fertilizer still produces three-fourths of a bale of cotton to^ the acre 

 (p. 14). The haying season for alfalfa extends from April to Novem- 

 ber, and during that time four to six crops are harvested. It is recom- 

 mended not to use the flowering period as a guide to the proper time 

 for cutting, but to choose the time when the new shoots are just, 

 starting from the base of the plants (p. 43). — A. P. 



Sppays and Sppayingr. By Prof. A. B. Cordley (U.S.A. St. 

 Bd. Hort. Oregon Rep. 1909-10; p. 63). — Spraying is absolutely 

 essential for the good management of fruit-orchards, but it is not neces- 

 sary to multiply the varieties of sprays used. Three are quite sufficient, 

 possibly one too many — viz. arseniate of lead, Bordeaux mixture, 

 lime-sulphur. — C. H. L. 



Stipulap-stpuctupes, Mopphologrical and Phylogenetic 



tudies of. By Prof. Dr. K. Domin (Ann. Jard. Bot. Buit. ser. 

 ii. vol. ix. pt. ii. pp. 117-326; 1911; 11 plates).— This is a comprehen- 

 sive discussion of th^ ixiorphology and phylogeny of stipular-structures 



