250 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



employ dogs in Garid, they are much used by horticulturists for draw - 

 tag oarte with flower* in pots. Besides using dogs by day,* they are 

 employed as guardians at night One illustration shows a large dog 

 within a high wheel which it tarns for pumping water. — G. H. 



Double Glass to Houses. By Eng. de Duren (Rev. Hort. Beige, 

 xwiii. No. 2, p. 26).— The author regards a layer of air between the glasses 

 M valuable in hindering the loss of heat from within the house. By an 

 ingenious electrical experiment by M. Schoentjes, it is found that for 

 double glasses the practical rule is that they should be eight centi- 

 metres apart. — G. II. 



Echinops, Globe Thistles. By Rev. C. Wolley Dod (Gard. Mag. 

 n. 2570, p. 69 ; 81/1 03).— A collective account of the Globe Thistles in 

 cultivation, with historical notes. There is a confused synonymy attached 

 to these plants, but this article goes far to elucidate it. As a fact, only 

 one or two species are grown in a general way, E. Bitro especially, and 

 this happens to be the finest of the genus. — W, G. 



Education, Horticultural : Outline of Greenhouse Laboratory 

 Work. By S. B. Green (U.S. A. Exp. Stn. Minnesota, Rep. 1902 ; 58 

 figs.). — An outline C3urse of instruction, twenty-two lessons, in horti- 

 cultural operations : a suggestive series of practical exercises worthy the 

 perusal of every gardener. — F. J. C. 



Electric Light, Effect of, in Forcing- Lilacs. By Ch. Grosdemange 

 (Rev. Hort. March 1, 1903, p. 117).— With a light of eighteen candles, 

 without reflector, M. Lucien Harancourt has cut flowers in fifteen days 

 in lieu of twenty-five, as under ordinary treatment. Description of general 

 treatment. Coleus, Pelargonium, and Ageratum were also brought on 

 much more rapidly under the influence of the light. — C. T. D. 



Eriostemon myoporoides. By E. Bedinghaus (Rev. Hort. Beige, 

 xxviii. No. 8, p. 180; col. pi.). — An Australian plant with narrow-lanceolate 

 leaves and white flowers. The author adds details upon the cultivation. 



G. H. 



Eryngiums (Sea Hollies). By Rev. C. Wolley Dod (Gard, Mag. 

 n. 2.~>7 1, p. 136 ; 28/2/03). — The writer reviews the species in cultivation 

 and comments upon their merits as garden plants, selecting the finest as 

 border plants. The confusion of identity of E. amethyst mum and E. 

 OUveriantm is explained, and other Eryngos are mentioned as worthy the 

 QOtioe of the oultivat nr. A good illustration of E. alpinum. accompanies 

 the article.— IP. G. 



Erysiphacese, Infection-powers of Ascospores in. By Ernest 

 S. Salmon (Joiim.H, . I N5, pp. 159 165, & 486, pp. 204-212 ; 5 & 6/ 1903). 

 A description in some detail of experiments showing the liability of 

 hurley i - infection by the ascopores of Erysiphc Graminis.—G. S. B. 



'.Ethereal Oils: their Significance in Xerophytes. By Oarl 



Detto (Flora, vol. xcii. 1908, pp. 147-199 ; 7 cuts).— The author examines 



