568 JOUENAL OF THE ROYAL HORTICULTURAL SOCIETY. 



or by planting the whole tuber and striking cuttings. The pots in 

 either case need protection in a frame or greenhouse. The tubers can 

 then be forced on, but this article gives directions for outdoor culture. 



Choose a warm spot in the garden, and dig out a patch 1 m. across by 

 20 cm. deep, which must be filled with fresh manure, watered, and well 

 turned over. Cover this with fine soil, and set the plants in, well in the 

 middle. The pits should be prepared at the beginning of May, and must 

 be 30 m. apart. Pack the plants with well decayed manure and water 

 occasionally. 



The tubers must be gathered when the leaves are touched by the first 

 frosts. They will not keep if frost-bitten, but must be quite ripe. Nor 

 will they keep if bruised in gathering, so that they are less easy to 

 manipulate than potatos. They must be well dried, even put in the 

 oven. Then pack them in dry cases, with alternate layers of fine sand and 

 sweet potatos, taking care that the tubers are not in contact. Store in a 

 dry place with even temperature, (3°-5° C. is recommended), and they will 

 keep all the winter. A few cuttings can be struck before the tops are 

 frosted, or some of the tubers may be set aside for propagation. — F. A. W. 



Tachinae, parasitic on Caterpillars. By Ch. Doublesel and 

 N. D. L. R. (Le Jard., vol. xxiii. No. 536, p. 180 ; June 20, 1909 ; 3 figs.)— 

 An interesting article on the Tachinae, which do good service in attacking 

 the Brown Tail Moth and other foes of arboriculture and horticulture. 

 These flies hover round the caterpillars and lay their eggs in them. The 

 unconscious host pursues its normal existence till, when it changes into a 

 chrysalis, the hungry and now full-grown larvge consume it entirely, and as 

 many as a dozen flies may issue from the chrysalis instead of a moth. 



F. A. W. 



Timbers of Dominica {Jour. Imp. Dep. Agr. W. I., vol. ix. No. 4, 

 1909). — An enumeration of 176 timber trees of Dominica, with their 

 botanical names, usual dimensions, and purposes to which the wood is 

 applied, supplemented by lists of woods suitable for various purposes. 



' M. C. C. 



Timbers Of Jamaica. By W. Harris, F.L.S. (Jour. Imp. Dep. Agr. 

 W. I., vol. ix. No. 4, 1909). — An enumeration of 108 timber trees of Jamaica 

 with there usual size, character of the wood, and purposes to which it is 

 applicable. With separate lists of woods suitable for various purposes. 



Tobacco, Experiments with Sumatra-Type (U.S.A. Agr. Exp. 



St., Pennsyl., Bull 89 ; Jan. 1909 ; plates).— An account of the ex- 

 periments in growing Sumatra -type tobacco for wrapping undertaken 

 at Milton Grove and at Cocalico, in Pennsylvania. 



The plants were grown under the shelter of cotton tents stretched on 

 laths, and the results seem to prove that the method is a successful one 

 and should make tobacco-growing quite a remunerative industry in that 

 part of Pennsylvania. — M. L. H. 



Tomato Fruit Rots in 1907. By V. Worrell Pool (U.S.A. Exp. 

 Stn., Nebraska, 1908 ; 10 plates).— This report enumerates the following 

 diseases : (1) black rot, Alternaria fasciculata (C. & D.) ; (2) Bhizoctonia, 



