56 CHARING HARVEY & PEAK, BY APPOINTMENT TO THE ROYAL INSTITU. POST OFFICE BRIDGE SETS AND MACMILLAN & CO.'S w.c. LIST. THE GEOLOGY OF SOUTH AFRICA. By F. H. HATCH, Ph.D., M.Inst.C.E., President of the Geological Society of South Africa; and G. S. CORSTORPHINE, B.Sc., Ph.D., Consulting Geologist to the Consolidated Coalfields of South Africa MINING WORLD.-"The authors are to be congratulated on their success. . . . It deserves, and will no doubt have, a wide circulation." 8vo. 21s. net. NEW AND REVISED EDITION, NOW READY. A TREATISE ON CHEMISTRY. By SIR H. E. ROSCOE, F.R.S., and C. SCHORLEMMER, F.R.S. Vol. I.-The Non-Metallic Elements. New Edition, completely revised by Sir H. E. ROSCOE, assisted by Dr. H. G. COLMAN and Dr. A. HARDEN. With 217 Illustrations. 8vo. 215. net. ATHENEUM." It is almost superfluous to say that the work maintains its original high standard, and is pre-eminent among works of its class in all languages." 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