782 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



vexans) in Goldschmidt's collection has already been described in the 

 Gardeners' Chronicle." It resembles D. aduncum, but exhibits 

 marked points of difference, particularly in the form of the lip. 



S. E. W. 



DendPObium vexans. By U. Dammer (Orchis, vol. iv. pt. vi. 

 pp. 85-87; 1 fig.) — The author confirms his previous statement that 

 this orchid is the type of a new species. — S. E. W. 



DiePVilla praecox *Floreal.' By Georges Bellan (Rev. Hort. 

 Jan. 1, 1910, pp. 12, 13; col. plates and 1 woodcut).— The illustra- 

 tions represent a very handsome corymb of bright rosy flowers much 

 larger than the type and very showy. It flowers about the middle of 

 May, somewhat later than the normal, but earlier than most other 

 varieties, forming a link in the succession of inflorescence. — C. T. D. 



Dipelta floribunda (Bot, Mag. tab. 8310).— Nat. ord. Capri- 

 foliaceae; tribe Lonicereae. China. Shrub, 10-16 feet tall, 

 resembling Diervilla; leaves 2-4 inches long; flowers axillary, clus- 

 tered; corolla, pale rose, 2-lipped, IJ inch long, streaked with orange 

 within, 1 inch across front. — G. II. 



Disa gfrandiflora. By Bohme (Garten flora, vol. lix. pt. xvii. 

 pp. 374, 375; 1 fig.).— This orchid likes a temperature of 46° to 50° F. 

 in winter, with a uniform degree of moisture. , When the flower-stem 

 appears move to a shady, airy, cool house, and spray frequently with 

 cold water. It bears beautiful red flowers in May, June, and July. 

 After flowering, the plant must be kept dry. — S. E. W. 



Disease-resistant Varieties of Farm Crops. By W. A. Orton 

 (U.S.A. Dept. Agr. Year Book, 1908; pp. 5; 2 plates).— The usual 

 startling figures as to estimated losses from plant diseases in cereals are 

 quoted. A general discussion of the reasons of resistance, nature of 

 parasites, &c., follows, and a list of cottons, cow-peas, water-melons, 

 wheats, &c., which have proved resistant are appended. — E. A. Bd. 



Diseases in the Garden in 1910. By K. Schechner (Oestr. Gart. 

 Zeit. vol. V. pt. xi. pp. 416-422; 3 figs.). — The wet season has been 

 disastrous to tomato and celery crops. Tomato plants have been 

 infested with Phytophthora infestans, accompanied by Cladosporium 

 fulvum, while Septoria Apii produced brown spots on the celery leaves 

 and checked the growth of the stalks. Spraying with Bordeaux mix- 

 ture is the best method of combating these attacks. In cool houses the 

 decorative Pteris umhrosa IislS suffered from the ravages of Aphelenchus 

 olesistus, which destroys the tissues of the leaves and roots. These 

 nematodes can be annihilated by boring holes in the soil, pouring in 

 carbon di-sulphide, and closing the mouth of the holes. The soil can 

 also be sterilized by boiling water. — S. E. V/. 



Diseases of Plants. By G. P. Clinton, ScD. (U.S.A. Exp. Stn., 



Connecticut, Biennial Report, 1907-1908).— The Eeport gives a survey 



