ECONOmC GEOLOGY. 199 



Wahl, Dr. W. H. lut'usorial Earth and its Uses. Quart. Joum, Sci. 



n. sor. vol. vi. pp. 336-351. 

 Notices the deposits of this earth in Europe and America. It is used 

 as a polishing agent, as a poor conductor of heat, in the manufacture 

 of dynamite, in making artificial stone, and in glazing pottery. "VV. W. 



Wanklyn, J. A., and E. T. Chapman. Water xVnalysis : a practical 

 treatise on the Examination of Potable Water. Ed. 4. Pp. x, 

 182. 8vo. London. 



Part iii. pp. 121-140: Examples of complete mineral anal3-ses ; 

 water supply to London, Manchester, Sunderland, Croydon, and Ponn. 



Wigner, G. W. On the Water Supply of the Isle of Thanet. Sam- 



tcmj liecord, pp. 181, 182. 

 Analyses of water supplied in Ramsgatc, Margate, Wcstgato, and 

 Proadstairs. 



Williams, James. Abstract of a notice on Mineral Lodes. Trans, 



11. Geol. Sac. Cornwall, vol. ix. p. 184. 

 Insists on the importance of working on the junctions of lodes. 



Williams, W. M. Iron and Steel Manufacture. Lecture 1. Joum. 



Soc. Arts, vol. xxiv. no. 1234, p. 827. 

 Describes the various ores of iron (pp. 827-830), noting their 

 localities. 



Wo3ikof, A. The World's Euiurc Coal Depot. Geogr. Maq. vol. iii. 



p. 224. 

 Corrects some statements of Mr. Kcr (pcc p. 197) as to the coal- 

 resources of llussia. 



Annuairo dos Mines et de la Metallurgie Frangaiscs, paraissant chaquo 

 annee pendant lo mois do mars. Pp. 408. 8vo. Paris, 



British Manufacturing Industries. 8vo. London. 



The following papers are in 2 vols., but the vols, are not numbered : — 



Metallic Mining, by W. W. Smyth, pp. 1-50. Under the following 

 heads: — Goldmines. Silver mines. Lead mines (1, of the limestone 

 formations, generally poor in silver ; 2, of the slaty rocks, often rich in 

 silver ; 3, in granite, variable as to silver, some very rich). Copper 

 mines. Tin mines. Mines of zinc, antimony, and manganese. Iron 

 mines. 



Coal, by A. Galletly, pp. 51-9G. Describes varieties of coal found 

 in the coal-me:i.sures : 1. Anthracite ; 2. Canncl coal ; 3. Household 

 coal (Caking, Cherry, and Splint Coal), llefers to the Prown Coal of 

 Povey Tracey, and to the distribution of coal-fields and their probable 

 duration. 



