380 



far outweighs this beneficial action. It occurs in Central and Southern 

 Russia, chiefly in hght, damp soil, near the surface. The only effective 

 preventive remedy consists of placing sand, soaked with kerosene, on 

 and aroimd the plot to be protected ; this must be repeated two or 

 three times during the summer. 



Ol (I. A.). Mtpbi 6opb6bi C"b rpymeBbiMTj niinMnbiUMKOiwb. [Remedies 

 against Hoplocampa brevis, Klug.]^- « flporpecCMBHOe CaflOBOfl- 

 CTBO M OropOflHMMeCTBO. » [Progressive Fruit-Growing and 

 Market - Gardening], Petrograd, xiii, no. 26, 9th July 1916, 

 pp. 654-655. 



The usual remedies against Hoplocampa brevis include the cultivation 

 of the soil beneath the trees early in spring and the watering of pear- 

 orchards in the first half of April in order to destroy the cocoons. The 

 flower buds should be sprayed with a solution of soft soap and carbohc 

 acid (3 lb. of soap and half a pint of carbohc acid in about 17 gallons of 

 water). In April the trees may also be sprayed with lead arsenate or 

 calcium arsenite. 



Ol(I. A.). npMivitHeHiii MbiLUbflKoeo- m Mbiiub;iKOBiiCTO-KMcnaro 

 Haipa BTj 6opb6t CT> HactKOMbllWH. [The use of sodium arsenite 

 and arsenate for the control of insect-pests.] — « DporpecCHBHOe 

 CaflOBOflCTBO M OropOflHMMeCTBO.» [Progressive Fruit-Growing 

 and Market-Gardening], Petrograd, xiii, no. 26, 9th July 1916, 

 pp. 655-656. 



In reply to a subscriber it is pointed out that the arsenite and arsenate 

 of sodium are not suitable for controlhng the caterpillars of Hypono- 

 meuta malinellus, as they are very injurious to plants, and lead arsenate 

 (Gypsin) or calcium arsenite should be used. The former can be 

 prepared by dissolving in separate earthenware or glass vessels 11 oz. 

 of chemically pure lead acetate and 4'5 oz. of pure sodium arsenite and 

 mixing them together. Calcium arsenite is prepared as follows : — • 

 About 27 gallons of water, 10 lb. of white arsenic (in lumps) and 20 lb. 

 of soda are put into a cast-iron boiler with a capacity of about 40 gallons 

 and boiled until the arsenic dissolves, after which 3 or 4 lb. of quick 

 lime is gradually added ; the liquid is again boiled for about an hour 

 and the whole made up to 200 gallons with water. 



Balabanov (M. S.). Kyjibiypa laSana h npMroTOBJieHie laOaMHaro 

 SKCipaKTa Aifl 6opb6bi C"b BpeflMTennMM. [The cultivation of 

 tobacco and the preparation of tobacco-extract for the control of 

 pests.] — «CaflOBafl BM6jliOTeKa.» [Garden Library Series], 

 Supplement to « riporpeccMBHoe CaflOBOflCTBO H OropoAHM- 

 MecTBO.» [Progressive Fruit-Growing and Market-Gardening], 

 Petrograd, 1916, 20 pp. 



This paper deals with the cultivation of Machorka tobacco and gives 

 a description of the preparation of tobacco extract on a large scale. 

 Two sheet-iron tanks, each with a capacity of about 55 gallons, are 



