JOURNAL OF THE CHEMICAL SOCIETY. CONTAINING THE PAPERS READ BEFORE THE SOCIETY AND ABSTRACTS OF CHEMICAL PAPERS PUBLISHED IN OTHER JOURNALS. Ph.D. E. J. M~LLS, E. ATKINSON D.Sc. F.C.S. HUGO MYJLLER Ph.D. F.R.S. C. L. BLOXAM Ph.D. H. W. PIKE,Ph.D. H. E. ARMSTRONG Ph.D. G. T. ATKINSOW. E. W. PR~VOST Ph.D. E. C. BABER. W. RAMSAY JAMES ROBINSON. BELL. JOHN BOLAS. R. ROUTLEDGE, THOMAS B.Sc. M.D. D.Sc. MORTYN T. L. BRUNTON J. SALTER. CBILDS,B.A. R. SCHENH,Ph.D. CHRISTOPHER M.D. C. SCHORLEMMER D. FERRIER F.R.S. D.Sc. WATSON WALTERFLIGHT SMITH. GILL. THOMAS M.D. C. HAUGHTON STEVENSON B. J. GROSJEAN. W. A. TILDEN,D.Sc. C. E. GROVES. WILLIAMVALENTIN. H. J. HELM. ROBERTWARINGTON. EDWARD WATTS D.Sc. KINCH. JOHN MUIR. C. R. A. WRIGHT,D.Sc. M. M. PATTISON C. H. PIESSE. NEW SERIES Vol. XII. (Entire Series Vol. XXVIIJ LONDON J. VAN VOORST 1 PATERNOSTER ROW. 1874. LONDON HARRISCIS AXD SONS PHIK'IERS IN ORDINARY TO HER MAJEsTY ST MARTIN'S L1NE.