NOTES AND ABSTRACTS. 



299 



Anemone japonica, Varieties of. By Jules Rudolph (Rev. 

 Hort. Nov. 16, 1905, pp. 542-544 ; 2 woodcuts). — A descriptive list 

 of 25 varieties, single, semi-double and double, among them some 

 dwarfs.— G. T. D. 



Angelonia integerrima. By S. A. Skan (Bot. Mag. tab. 7999).— 

 Nat. ord. Scrophidariacecs, tribe Hemimeridca ; Brazil and Paraguay. 

 Herb or undershrub, 3 ft. high. Corolla, 7 lines across, pale mauve 

 spotted with purple, broadly saccate. — G. H. 



Anomalous Dicotyledons, The Embryology of some. By 



D. M. Mottier (Ann. Bot. xix. Oct. 1905, pp. 447-461 ; 2 plates).— 

 The species investigated were Actea alba, Delphinium tricorne, Aquilcgia 

 canadensis, Syndesmon thalictroides of Ranunculacea?, and Sanguinaria 

 canadensis and Stylophorum diphyllum of the Papaveraceae. In all 

 species the development of the embryo was carefully traced from the 

 youngest stages to that found in the ripe seed. 



All except Stylophorum and Syndesmon show a certain well-marked 

 anomalous character. In the two exceptions the embryo is usually 

 typically dicotyledonous. — A. D. C. 



Aphides. By T. Pengande (U.S.A. Dep. Agr. Div. Entom. Bull 44, 

 pp. 5-23 ; 4 figs.).— The author, in investigating the aphides occurring on* 

 grain, finds there is a great amount of misconception as to the nomen- 

 clature of the various species. The European grain louse (Siphocoryne 

 avence Fab.) lays its shiny black winter eggs in October or later on apple, 

 pear, quince, hawthorn, and plum. They hatch out in March or April, 

 feed on the young leaves and shoots, and produce young in about a month. 

 The second generation reaches maturity during the first half of May, and 

 most acquire wings enabling them to spread. The third, fourth, and fifth 

 generations are produced on the trees, the last reaching maturity about 

 the early part of July. These migrate on to grasses such as wheat, 

 rye, &c, where they remain until October or November. A number of 

 natural enemies are mentioned, and a full description of the various stages 

 through which the insect passes is given. The English grain louse 

 (Macrosiphum granaria Buckt.) is next dealt with, the life-history of 

 which is very incompletely known. The German plant louse (M. cerealis 

 Kalt.) also feeds on grasses and clover, and is described, except the 

 sexual generation, which is unknown, and a new species of Macrosiphum 

 (M. trifolii) is described. The last feeds on clover. — F. J. C. 



Apple Bitter Rot, Control of. By W. M. Scott (U.S.A. Dep. Agr. 

 Bull. 93, March 14, 1906 ; with 8 plates). — This disease, referred to the 

 agency of Glceosporium fructigenum, or its latest synonym Glomerella 

 rufo-maculans, causes severe loss to apple growers in the United States, 

 estimated in 1900 at ten million dollars. It has for a number of years 

 been under investigation, and although many attempts have been made 

 to control the disease by the ordinary spraying methods, the results have 

 been unsuccessful. Mr. Scott has apparently discovered the reason for 

 these failures, and the results of his investigations indicate that the 

 disease may be successfully controlled at a nominal cost. 



