302 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



about the peculiar likes and dislikes of Alpine Dianthuses when under 

 culture. — W. G. 



Disa Hybrids. By G. Borneniann (Gartenflora, p. 113 ; pi. 1496 ; 



1/3/1902). — A coloured plate and brief description of Disa langleyensis 

 (D. racemosa x D. tripctaloidcs) and Disa Veitchii (D. grandiflora 

 x D. racemosa). D. langleyensis has bluish-green leaves and small 

 carmine-purple flowers ; D. Veitchii has bright green leaves, and the 

 flowers are larger. The upper cup-like petal of each flower is pale rose, 

 the two lower ones being magenta-carmine. — J. P. 



Distremmena marmorata. By L. Kitzenberg (Die Gart. p. 293 ; 

 22/3, 1902; with figure). — Described as a very destructive insect, 

 increasing quickly. Imported with dried Cycas stems from Japan. At 

 present very little is known about the habit of this insect. — G. B. 



Double Fertilisation of Monotropa uniflora, L. By K. Shibata 

 (Flora, vol. xc. 1902, pp. 61-66 ; pi. 1). — The union of the second male 

 nucleus may take place with the upper " polar nucleus " before it fuses 

 with the lower, or it may join them as they meet ; or, again, it may (when 

 the temperature is lower) fuse with the secondary nucleus produced by 

 their fusion. In the beautiful mitotic figures of the endosperm no 

 centrosomes were seen. — M. H. 



Drosera, The Outer Seed-coat in German sp. of. By Dr. 



Holzner (Flora, xc. 1902, pp. 342, 343 ; cuts 1-4).— That of D. rotundi- 

 folia is lax, open-mouthed, distant from the inner, contains air, which 

 facilitates dissemination by breezes, and enables it to float (as long as a 

 month) on water. The outer seed-coat of D. intermedia is appressed to 

 the inner and seed, but each cell is prolonged at its centre into a short 

 hair-like tube filled with air at maturity. — M. H. 



Drosera filiformis and D. intermedia, Observations on 

 some Hybrids between. By J. Muirhead Macfarlane, D.Sc. (Contr. 

 Bot. Lab. Phil. ii. No. 1, 1898, p. 87, pi. 12). — This paper consists of a 

 detailed comparison of plants of Drosera filiformis and D. intermedia 

 with those of another species with which they were found growing 

 amongst the Pine barren swamps of New Jersey, and transplanted to the 

 University Botanic Garden. The supposed hybrid between the two 

 species, and here called Drosera liybrida. Histological investigation of 

 the three forms demonstrates a minute blending in all parts of the hybrids 

 of the histological peculiarities of D. filiformis and D. intermedia. 



In this, as in some other hybrids studied, certain parts or organs tend 

 rather more towards one parent than the other. The balance of develop- 

 ment throughout in the present case is evidently towards D. intermedia, 

 yet the apparently prepotent parent is the smaller and more delicate 

 species. — M. C. C. 



Economic Entomology, Experimental Work in. By J. B. 



Smith (U.S.A. E.rp. Stn., New Jersey, Bull. 155 ; 1/1902).— A pamphlet 

 of seventy-two pages, giving an account of the work done in the experi- 



