848 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



of nitrogen, phosphoric acid, and silica. Azotobakter chroococcum 

 and Clostridium Pasteurianum occur in sea-water, and can utilise free 

 nitrogen ; but it is not proved that they can hand on their superfluous 

 formation to other plants. The author supposes that the rich animal flora 

 of Algal beds and the bacteria of decomposition which attack their waste 

 products will greatly influence the nitrogen supply of the Algae. 



G. F. S.-E. 



Nitrogen to Plants, Sources of. By MM. Laurent and Marchal . 



(" Recherches sur la Synthase des Substances Albuminoides par les 

 Vegotaux " (Bull. Dep. Agr. Jam. ii. pt. 3, p. 59). — Quoted from 

 Nature : — " While nitrates are of chief importance, there are many 

 plants, forest trees, and the vegetation of marshes that must depend 

 entirely on compound of ammonia for the supply of nitrogen. The lower 

 plants, devoid of chlorophyll, can manufacture albuminoids in the dark, 

 the necessary energy in this case being derived from the decomposition of 

 organic compounds." — G. H. 



Nucleolus and Nuclear Division in the Root Apex of Phaseo- 

 lus, The. By Harold Wager (Ann. Bot. xviii. Jan. 1904, pp. 29-55 ; 

 1 plate). — A technical paper, being a study of the root apex from a cyto- 

 logical standpoint. The author believes the nucleolus to be intimately 

 connected with the nuclear reticulum, and to contain nearly all the chro- 

 matin of the nucleus. The chromatin is transferred, previous to division, 

 into the nuclear thread ; in the reconstruction of the daughter nuclei, the 

 chromosomes become fused into a number of more or less spherical or 

 irregular masses which unite to form the daughter nucleoli. — A. D. C. 



Nymphsea orientalis. By E. Jahn (Die Gart. No. 15, p. 172, 



January 9, 1904). — A Japanese miniature Water-lily. The seeds were 

 received from the Botanic Garden of Tokio. It produced flowers four 

 months after sowing. The small flowers, 35-40 mm. diameter, are snow- 

 white, having 10 petals, and the buds are quadrangular in shape. The 

 leaves are* ovate, 1\ to 8J centimetres. A most desirable plant for small 

 aquaria. — (7. B. 



Oak Tortrix, The. By Cecil Warburton (Jour. B.A.S. vol. 63, 

 1903, p. 303).— At a meeting of the Royal Agricultural Society held on 

 May 22, 1902, Sir William Vincent and H.R.H. Prince Christian referred 

 to the depredations of this pest in Windsor Great Park. A report was 

 subsequently submitted setting forth the life-history of the pest and the 

 nature of the attack. The natural enemies which are said to prey upon 

 the caterpillars are rooks, jackdaws, sparrows, tits, and woodpeckers. 

 Their insect parasites are also numerous, but their operations do not 

 prevent the immediato ill effects of the attack. Spraying is dismissed as 

 impracticable.- -B. N. 



Oaks, A Leaf-curl Disease of. ByE. Mead Wilcox, Ph. I). (U.S.A. 



Dep. Ayr. Exp, Sin. Alabama, Bull. 12G, Oct. 1903; one plate and 

 three figs.). — After enumerating the six species of Oak of the chief 

 importance in this State, the bulletin proceeds to give the symptoms of 



