95 



The whole of the amount required is imported from abroad, and the 

 available stocks appear to be very small and can hardly cover the 

 demand. It is suggested that the sugar-refineries should themselves 

 manufacture the necessary quantity of barium chloride for their 

 plantations from barium carbonate, though the necessary raw material, 

 the mineral " Witherite," only occurs in payable quantities in England ; 

 it might be possible, though more troublesome, to prepare barium 

 chloride from barium sulphate. 



Lebedev (F. N.). 06-b onpbiCKMBaienflx-b h MHceKTMCHflax-b. [On 



sprayers and insecticides], pp. 3-5. 



Hitherto, Germany has been the chief and almost the only country 

 supplying Russia with sprayers and insecticides, though the former 

 were very often inferior machines, and one Russian factory at least 

 could undertake to manufacture sprayers. The use of sodium arsenite 

 instead of Paris green is advocated. 



AvERiN (V. G.). Ktj Bonpocy o5i3 onpbiCKMBaTenflxij m HHceHTMCH- 

 Aaxi). [The question of sprayers and insecticides], pp. 5-6. 



A list of 13 Russian factories which could manufacture sprayers is 

 given. 



Serbinov (I. L.). MhCTpyKnifl flnn coSMpaHifl rpM6Hbix-b, npoToaoii- 

 Hbixi) v\ OaKTepianbHbix-b 3a5ontBaHiM HactKOMbix-b. [Instruc- 

 tions for the collection of fungoid, protozoal, and bacterial 

 diseases of insects], pp. 6-8. 



The author describes the symptoms of the diseases of insects pro- 

 duced by fungi, protozoa, or bacteria and gives instructions for the 

 preparation of examples thus attacked before they are sent to him to 

 the Central Phytopathological Station of the Imperial Botanical Garden 

 of Peter the Great in Petrograd. 



The dead larvae, pupae, or imagines must first be dried at the room- 

 temperature on a sheet of clean paper and then, together with their 

 ejections, if any, be wrapped in separate sheets of paper and sent in 

 wooden, not in metallic boxes, accompanied by the necessary data. 

 It is also advisable to send some of the same material fixed in 10 per 

 cent, formalin, or in 70 per cent, alcohol to which a few drops of iodine 

 have been added. Living specimens, which are specially necessary in 

 order to cultivate the microbes at the station, should be sent in a 

 10 per cent, salt solution. 



Pear Leaf Blister Mite. — Jl. Bd. Agric, London, xxi no. 8, November 

 1914, pp. 731-732. 



The Board's Leaflet No. 239 on the pear leaf blister mite, Eriophyes 

 pyri, has been revised and the following methods of dealing with this 

 pest replace those previously given. 



In mild cases, a single application of a winter wash may be sufficient, 

 but otherwise two applications should be made as suggested below. 

 (1). Lime-Sulphur Washes. A lime-sulphur wash at winter strength 



