Price HALF-A-CROWN. 

 Subscription Price, TWENTY-FIVE SHILLINGS per Annum, Post Free. 



VOL. V. 



No. 27. 



cicncc 



progress 



A MONTHLY REVIEW OF CURRENT SCIENTIFIC INVESTIGATION. 



Conducted by HENRY C. BURDETT. 



Edited by J. BRETLAND FARMER, M.A. 



WITH THE CO-OPERATION OF THE FOLLOWING EDITORIAL COMMITTEE:— 



H. E. ARMSTRONG, F.R.S., Professor of Chemistry at the City and Guilds of London Institute for Technical 



Education. 

 W. R. DUNSTAN, F.R.S., Professor of Chemistry, St. Thomas' Hospital and Pharmaceutical Society, 



London. 



G. F. FITZGERALD, F.R.S., Professor of Natural and Experimental Philosophy in the University of Dublin. 



C. S. SHERRINGTON, F.R.S., Professor of Physiology in University College, Liverpool. 



J. W. JUDD, C.B., F.R.S., Dean of the Royal College of Science, London. 



W. J. SOLLAS, F.R.S., Professor of Geology in the University of Dublin. 



G. B. HOWES, F.Z.S., Professor of Zoology, Royal College of Science, London. 



H. MARSHALL WARD, F.R.S., Professor of Botany in the University of Cambridge. 



H. A. MIERS, M.A., Professor of Mineralogy in the University of Oxford. 



MAY, 1896. 



CONTENTS. 



THE PAST, PRESENT, AND FUTURE WATER SUPPLY OF LONDON. By E. 



FRANKLAND, F.R.S 



SOME RECENT MEMOIRS UPON OLIGOCH>ETA. By F. E. BEDDARD, M.A., F.R.S. 



NOTES ON ATOMIC WEIGHTS. By ALEXANDER SCOTT, M.A., Jacksonian Demon- 

 strator in the University of Cambridge 



THE STELAR THEORY: A History and a Criticism (Part II.). By A. G. TANSLEY, 

 B.A 



THE PRESENT POSITION OF THE CELL-THEORY (Part II.). By G. C. BOURNE, 

 M.A. , Fellow of New College, Oxford 



FERNS: APOSPOROUS AND APOGAMOUS. By C. T. DRUERY, F.L.S 



APPENDICES: 



I. NOTICES OF BOOKS 



II. CHEMICAL LITERATURE FOR MARCH, 1896 



163 



190 



202 



215 



227 

 242 



XXI 

 XXV 



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