(f rowers are therefore limited in the first case to the arsenates of lead 

 and lime. These were formerly prepared on the spot by mixing a 

 soluble salt of lead or milk of lime with a solution of arsenate of soda. 

 The arsenates of lead or lime thus formed and used at once remained 

 in a better state of suspension than is obtained by dissolving in water 

 arsenates of lead or lime, dry or in a paste, as sold commercially. 

 Under these circumstances the use of a hot-water spray is recommended. 



The second group of compounds are all forbidden, both because they 

 are soluble and also because they are used during the prohibited season. 

 Here again hot-water spraying is the only efficacious alternative, and 

 if this has to be adopted, it will lead to a great consumption of fuel at a 

 time when it can ill be spared. The removal of the present restrictions 

 and the substitition of washing with arsenical compounds for hot- water 

 spraying would effect a saving of from 50,000 to 100,000 tons of coal. 

 The author therefore advocates that the use of arsenicals should be 

 authorised during winter up to the bursting of the leaf-buds. 



Droits de Douane sur les Ars6niates et Ac6tates de Plomb. [Customs 

 Duties on Arsenates and Acetates of Lead.] — Rev. Viticulture, 

 Paris, xlv, no. 1169, 23rd November 1916, p. 345. 



In France arsenate of lead is subject to an import duty of 5 % of 

 its value plus 2s. per 220 lb. net at the general rate and 5 % plus 

 Is. 8d. at the minimum rate. 



Acetate of lead is subject to an import duty of 12.s. od. per 220 lb. net 

 at the general rate and 6s. 4d. per 220 lb. at the minimum rate. 

 Importations direct from the United States to France are subject to 

 the general rate, but if they come via any other European country they 

 are subject to a surtax of 3s. per 220 lb. Importations of English 

 origin are subject to the minimum tariff. 



RoEPKE (W.). (1) Sprinkhanenplagen. [Locust Plagues.] — Reprints 

 from " Teijsmannia,''^ Bafavia, 1915, nos. 1 & 2, pp. 115-124:, 

 nos. 6 & 7, pp. 337-358 and no. 12, pp. 758-790, 8 plates, 2 figs. 

 (2) Sprinkhanen op Java. [Locusts in Java.]— Separate from De 

 Indische Mercuur, 14th July 1916, 13 pp. [Received 11th 

 December 1916.] 



It is now a little over two years since the appearance of locusts in 

 Java in large numbers began to cause serious alarm. They are by no 

 means new to the island, as they are mentioned as far back as 1878. 

 The primary focus of infestation is in the teak forests of Middle Java, 

 which extend irregularly from East to West for 125 miles, and are 

 estimated to cover nearly 2,000 square miles of country. In addition 

 to this primary focus, the localities of five secondary ones are given ; 

 these are outside the teak forests, which are from 200 to 320 feet above 

 sea-level, while the elevation of one of the secondarv areas is nearly 

 2,700 feet. 



The destructive species in Java is believed to be Cyrtanthacris 

 meJanocornis, Serv. (nigricornis, Burm.), which is described at length, 

 with photographs. According to Koningsberger, C. (Acridiimi) rosea, 

 De G., probably does not occur in Java. There is however some doubt , 

 as to the species, as it is not identical with that occurring in the Straits 

 Settlements, the Philippines or Celebes. In normal years when the 



