1202 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Water Supply. By A. J. McClatchie ( U.S.A. Agr. Exp. Stn. Arizona, 

 Hull. No. 43 ; 9 figs.). — Deals with the present distribution, and future 

 possibilities, of the water supply of the Salt River Valley. 



It is estimated that the available supply, if properly managed, would 

 irrigate 110,000 acres, and that the construction of a dam below the 

 Ton to basin would increase it sufficiently to irrigate 160,000 to 180,000 

 acres, and support a population in the valley two to three times as great 

 as at present. — E. A. B. 



Weeds in General : Two newcomers into Pennsylvania. By W. A. 

 Buckhout (U.S.A. Agr. Exp. Stn. Pennsylvania, Bull. 58, March 1902, 

 illustrated). — A plea for better and more thorough cultivation as a means 

 of keeping out weeds, together with a more particular account of the 

 Keeled Garlic (Allium carinatum) and the Southern Scabious (Scabiosa 

 australis), two weeds, new to Pennsylvania, possessing qualities which 

 render them liable to become serious pests. — C. H. C. 



West Indian and South American Plants (Beih. Bot. Cent. 

 bd. xiii. ht. 1, pp. 1-90). — Princess Theresa of Bavaria has made 

 an excursion to the Lesser Antilles, Venezuela, Colombia, Ecuador, Peru, 

 Bolivia, Chili, the Argentine, and Brazil. This paper gives a complete 

 account of the collection, which includes 121 species. The collection 

 has been named and new species described by the most eminent specialists 

 in Austria and Germany. There are new species of Uredo, Tillandsia, 

 Eutoca, Miconia, Salvia (two), Solanum (two), Senecio, and a critical 

 account and localities of all the specimens. There are five plates. 



G. F. S.-E. 



White Fly (Aleyrodes vapor ariorum, ^Westw.). By W. E. Britten 

 (U.S.A. Exp. Stn. Conn., Bull. 110, 9,1902; 5 figs, and 4 plates).— 

 This insect, which occurs in this country, is reported as very injurious to 

 Tomatcs at New Haven, Conn., and to Strawberries, Asters, Chrysanthe- 

 mums, && in other localities. The insect belongs to the Aleyrodidce, 

 and is allied to the Coccidce (scale insects) and the AphididcB (aphides), 

 differing from the former in having both sexes winged, and from the latter 

 in being fastened to the leaf in the nymph stage. It injures plants by 

 sucking the sap, thus causing the collapse of certain of the plant-cells. 

 A list of sixty plants upon which it feeds is given. Fumigation with 

 tobacco was ineffectual ; hydrocyanic-acid gas was tried with excellent 

 results, but care is required in order that the plants (Tomatos in this case) 

 should not suffer ; one ounce of potassium cyanide per thousand feet seems 

 sufficient. Spraying with whale-oil soap (1 lb. to 5 gallons water), 

 fir-tree oil (I pint to 2 gallons), were both successful, but spraying with 

 common laundry soap and water (1 lb. to 8 gallons) proved the best and 

 cheapest remedy. (For description of insect see Gard. Chron. 1856, 

 p. nr/2.)-/'. C. 



White Poplar. Ed. (Le Jard. Feb. 20, 1902, p. 58). — A giant 

 tree near Troyes, blown down by a gale, was 400 years old and measured 

 1 10 feet high, with a circumference of twenty-five feet at four feet from 

 the ground.— C. W. D. 



