148 . NEW BOOKb. 



undissolved gold " : H. A. White. In the treatment of slime by cyanide 

 solution difficulty arises in securing an accurate estimate of undissolved 

 gold. The method proposed depends on the fact that alkaline perman- 

 ganate in excess destroys the power of .1% potassium cyanide to dis- 

 solve gold leaf. — ■' The assay of gold-bearing cyanide solutions by electro- 

 lysis " : C. Crichton. The author described a method of depositing the 

 gold electrolytically on a lead cathode, whence it is subsequently obtained 

 by cupellation. The cathodes are made from ordinary assay lead -foil, 

 and a native can, during a few hours, make enough for 200 to 300 assays. 

 The anodes are 5-i6th in. arc-lamp carbons. The apparatus consists of 

 four oblong frames, each holding eight beakers with centrally clamped 

 anodes. The solutions for assay are measured off in 10 A.T. portions, 

 and in four hours the deposition of the gold is complete, the current 

 being obtained from three two-volt accumulator cells charged from a direct 

 current lighting circuit through a suitable lamp resistance. 



South African Institute of Electrical Engineers. — Thirrs-h^, 

 September 21st: J. H. Rider, V.P.I. E.E., President, in the chair. — "A 

 comparison of costs between the Ward-Leonard and Three-phase wmding 

 systems " : A. H. O. Renner. Assuming that the cost of the Ward- 

 Leonard system is initially the higher, the author argued that this is 

 largely counterbalanced by the difference in working costs, and he pro- 

 ceeded to discuss the influence of the higher cost due, in '.he Ward- 

 Leonard system, to the motor generator set. 



South African Society of Civil Engineeks. — Wednesda}-, October 

 iith: Col. G. T. Nicholson, M.I.C.E.. President, in the chair. — " JNIethods 

 of construction and prime costs " : Prof. A. E. Snape. Obervations on 

 the sewage disposal works at Norv.icli and the main draina.ge works in 

 London. 



NEW BOOKS. 



Hollis, Hon. A. C. — Vocabulary of English laords and sentences, trans- 

 lated into six languages or dialects, vis.: Zanzibar Sivahili 

 (Ki-Unguja), Mombasa Si^'ahili {Ki-Mvita) , Lainu Swahili (Ki- 

 Aniii), Patta-Sivahili (Ki-Patc), Siyu Szvahili (Ki-Siu), Bajun 

 (Faza), Szi.'ahili (Ki-Tikun). [London] n.d. 8\ in X 5 in., 

 pp. 24. 



Kohlschuitter, Dr. E!. — I'cbcr den Ban der Erdkruste in Dcnt^ch- 

 Ostafrika. Vorlaufigc Mitteilung. [Gottingen: 191T] 9?;- in. X 

 7 in., pp. 40. Diagrams. 



Madan, A. C. — Living speech in Central and South Africa: an essay in- 

 troductory to the study of the Bantu family of languages. 

 Oxford: Clarendon Press, 1911. 6s. nett. 



Beech, M. W. H.—The Suk: their language and folk loie. With an 

 introduction by Sir Charles Elliot. Oxford: Clarendon Press, 

 191 1, pp. xxiv, 151. 24 plates, 3 maps. 12s. 6d. nett. 



Dudgeon, G. C—The Agricultural and Forest products of British IVcst 

 Africa. London: John Murrav, 1911. '3p. x, 170. 8vo. iS oz., 

 53. 



