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JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



comparison being made with some of the exotic centipedes which are 

 poisonous to man. Our British species 'is harmless to man, and is 

 generally regarded as a useful ally of the horticulturist. — W. A. V. 



Cereus nudiflorus. By J. N. Bose {Contr. jr. U.S.A. Herh. xii. 

 (1909); pt. 9; pp. 397-398; 3 plates).— This cactus, which forms a tree 

 22 feet m height, has been rediscovered in Cuba. The species was 

 referred by Schumann to C. lepidotus, and the name nudiflorus (of 

 Engelmann) does not appear in Index Kewensis. — F. J. C. 



Chenopodium amaranticolor {Jour. Soc. Nat. Hort. Fr., Sept. 

 1909, p. 517). — M. Bois has introduced this plant, which is recom- 

 mended as a useful, very fast-growing vegetable, to take the place of 

 summer spinach. 



It does not flower early enough, however, to set seed in the climate 

 of Paris.— M. L. H. 



Chermes. By 0. Niisslin {Nat. Zeit. Land-Forst. viii. pp. 65-105; 

 Feb. 1910). — Students of this group of insects will find this a useful 

 paper summarizing recent progress, which has been rapid. The 

 author is a well-known authority on the group, especially on the 

 Spruce Chermes, and he gives an excellent summary of the systematic 

 arrangement as now known. Life-histories of the better-known forms 

 are also given, and there is an analytical table for determination of the 

 more important species, with numerous figures. — W . G. S. 



Chestnut-bark Disease, Present Status of the. By H. 



Metcalf and J. F. Collins {U.S.A. Dep. Agr., Bur. PI. Ind., Bull. 141, 

 pt. V. Aug. 1909). — Caused by the fungus Diaporthe parasitica, the 

 chestnut-bark disease has of late done a considerable amount of damage 

 to both old and. young trees in and around the city of New York. 

 Methods of coping with the disease and some illustrations of affected 

 trees are given. — A. D. W. 



Christmas Rose, Transplanting" the. By E. H. Jenkins 

 {Garden, Sept. 11, 1909, p. 445). — This should be done in September, 

 transplanting in spring being a " delusion and a snare." The Christ- 

 mas rose produces two sets of roots each year — the main or basal roots 

 in the early autumn, and lateral or fibrous roots in the spring with 

 the coming of the new leafage. It is important to procure the prin- 

 cipal set of roots if the secondary are to exist at all or exercise their 

 proper functions. The main roots are brittle, and, if mutilated, often j 

 decay to the base of the plant. By the destruction of these main roots | 

 in spring planting a debilitated condition is set up. The plants should ( 

 never be transplanted bodily in large specimens. The best way to 

 divide a clump is to lay it on its side and insert two small hand forks, 

 back to back; then divide the clump by wrenching them outwards in 

 opposite directions. Plants with two or three crowns are the best for 

 planting, and division to nearly single crowns every two or three years 

 has been found successful. — H. R. D. 



