NOTES AND ABSTEACTS. 



237 



author gives minute details regarding the life-history, food plants, 

 and methods of prevention and destruction. Among the latter he 

 advises sifting road dust or ashes over the majority of the plants, and 

 covering the remainder with an arsenical solution. The beetles will 

 concentrate on the clean plants, where they will be killed by the poison. 



V. G. J. 



Cyclamens, The History of the. By Le Texnier {Eev. Hort., 



Sept. 1, 1909, pp. 408-411). — A very interesting account of the genus 

 and the development under cultivation of the various species and 

 varieties concerned. — C. T. D. 



Delphinium sulphureum ( = D. Zalil). By F. Eoll {Die Gart.; 

 April 30, 1910, p. 209). — Although this is the only species of hardy 

 herbaceous Delphinium with yellow flowers, and though of far greater 

 elegance than the white or blue flowering D. formosum forms, it is 

 rarely met with in gardens. It does best in a hght soil and warm sunny 

 position. The only way to increase it is by seeds which are best sown 

 as soon as ripe. The rootstock is tuberous, not unlike that of Aconitum. 

 During a cold wet summer the flowers are of a rather pale yellow, but 

 in warm dry weather they are of a uniform goFden yellow, quite as 

 large as those of the best blue Delpliinium of our gardens, and of 

 graceful habit. — G. R. 



Dewberry Growing*. By 0. B. Whipple (U.S.A. Exp. Stn. 



Colorado, Bull. 136; Jan. 1909). — Some parts of Colorado, especially 

 those with a summer temperature of 90^ and from 5,500 to 6,500 feet 

 high, grow very good dewberries. In one plantation three-quarters of 

 an acre yielded 345 crates, and a gross return of over $650. But 

 over-production is possible on account of the speedy deterioration of 

 fruit in marketing; it must be on the market within thirty-six hours 

 after picking. The plants require to be covered during the winter 

 (with soil), but, given protection and good cultivation and manure, the 

 life of the dewberry plant is a long one. In shipping the crates of 

 berries, ventilation seems more important than refrigeration. — C. H. L. 



DiOOn spinulOSUm [Bat. Gaz. vol. xlviii. December 1909, pp. 401- 

 413; with 7 figs.). — Professor Charles J. Chamberlain gives an excel- 

 lent photograph and a fresh description of this rare Cycad, and also 

 discusses the distribution, character of thie cones, and affinities of the 

 three species of this genus. — G. F. S.-E. 



Dipelta ventricosa. By J. Hutchinson {Bot. Mag. tab. 8294). 

 Nat. ord. Caprifoliaceae ; tribe Lonicereae. Western China. Shrub 

 7-18 feet high. Leaves ovate. Flowers axillary, pedicellate. Bracts 6, 

 2 very small, 4 large at base of ovary. Corolla 1^ inch long, red 

 without, orange within. — G. H. 



Dipsaceae. By P. van Tieghem {Ann. Sc. Nat. vol. x. Nos. 1-3, 

 pp. 149-200). — Comparison of the inflorescence, flowers, fruit, and seed 

 shows a wide difference between the Valerianaceae and the Dipsaceae. 



