'266 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



PotatOS, The Greening- of. By George Massee (Jozir. Bd. Agr. 

 xvi. 3, p. 177; 1 plate). — Experiments have been conducted at Kew 

 for the purpose of ascertaining in what particular manner greening " 

 proves beneficial in potatos intended for seed. 



The experiments show (1) that a potato not greened " loses just 

 over six times as much in weight during the season as a potato of 

 equal weight that has been " greened " ; (2) that a potato " greened " 

 in spring loses twice as much in weight as a potato " greened " imme- 

 diately after lifting in autumn, other things being equal ; (3) " greening " 

 in autumn will check the ravages of winter rot. — J. S. 



Primula Obconica, New Forms {Die Gart.; January 15, 1910, 

 p. 34, with coloured plate). — Large flowering forms with pure white, 

 crimson, red, and lilac flowers are figured, from Mr. George Arends, of 

 Eonsdorf, Germany. — G. R. 



Properties and Uses of the Southern Pines. By H. S. Betts 

 (U.S.A. Dep. Agr., Forest Service, Giro. 164, Aug, 1909).— The three 

 principal pines of the Southern United States are Pinus palustris, 

 P. echinata, and P. Taeda. The enemies, mechanical properties, and 

 utilization of these pines are here fully dealt with. — A. D. W. 



Raspberry Beetle (By turns unicolor). By W. H. Goodwin 

 {U.S.A. Exj). Stn. New York, Bull. 202; February 1909; 3 plates).— 

 The author gives a minute description of this destructive pest, which 

 is closely allied to the European species B. tomentosus, and recom- 

 mends spraying with 4 lb. arsenate of lead to 50 gallons of water, just 

 before the beetles emerge from the soil. In connection with this he 

 suggests that thorough cultivation late in the fall, close up around 

 the canes, will destroy large numbers of pupse. 



The result of experiments shows that the yield of berries in 1908 

 on sprayed plots was 50 bushels, against 22 bushels in 1907 on the same 

 plots unsprayed. The illustrations on pp. 180-185 give a good idea of 

 the damage done by the beetles to buds, berries, and young leaves. 



V. G. J. 



Red Spider, The Common {Tetranychus himaculatus Harvey) 

 By F. H. Chittenden, Sc.D. {U.S.A. Dep. Agr., Bur. Entom., Giro. 

 104; January 1909; 4 figs.). — A detailed description is given of the hfe 

 history, food plants, and distribution of the red spider, which is, 

 properly speaking, not a spider, but a spinning mite. 



The author then proceeds to discuss the relative merits of kerosene 

 soap emulsion, lye-sulphur, sulphur water, and lime-sulphur for the 

 destruction of the pest, and summarizes the remedies as follows: — • 



For the greenhouse and general use, sulphur and neutral (Castile) 

 soap, whale oil, and other soap solutions, kerosene soap emulsion, and 

 spraying with water. For the treatment of trees and shrubs, the same 

 as the above, with the addition of resin wash and the lime-sulphur and 

 lye-sulphur mixtures. 



