A Case of Monochromatic Vision. By Sir W. de W. Abney, K.C.B., 

 F.K.S 179 



On the Influence of the Temperature of Liquid Air on Bacteria. By 

 Allan Macfadyen, M.D. Communicated by Lord Lister, Pres. R.S. 180 



Meeting of February 8, 1900, and List of Papers read 183 



On Electrical Effects due to Evaporation of Sodium in Air and other 

 Gases. By W. Craig Henderson, M.A., B.Sc, late 1851 Exhibition 

 Science Scholar. Communicated by Lord Kelvin, F.E.S 183 



Meeting of February 15, 1900, and List of Papers read 186 



The Genesis and Development of the Wall and Connecting Threads in 

 the Plant Cell. Pi'eliminary Communication. By Walter Gardiner, 

 M.A., F.E.S., Fellow and Bursar of Clare College, Cambridge 186 



Meeting of February 22, 1900, and List of Papers read 188 



Preliminary Note on the Spectrum of the Corona. Part 2. By Sir 

 Norman Locky er, K. C. B. , F. R. S 189 



The Ionization of Dilute Solutions at the Freezing Point. By W. C. D. 

 Whetham, M.A., Fellow of Trinity College, Cambridge. Communi- 

 cated by E. H. Griffiths, F.R.S 192 



On the Relation of Artificial Colour-blindness to Successive Contrast. 

 By George J. Burch, M. A., Oxon., Reading College, Reading. Com- 

 municated by Professor Gotch, F.R.S 204 



On the Production of Artificial Colour-blindness by Moonlight. By 

 George J. Burch, M. A., Oxon., Reading College, Reading. Communi- 

 cated by Professor Gotch, F.R.S 216 



No. 428. 



Meeting of March 1, 1900, and List of Candidates 220 



List of Papers read March 1, 1900 221 



Researches on Modern Expiosives. Second Communication. By W. 

 MacNab, F.I.C., and E. Ristori, Associate M. Inst., C.E., F.R.A.S. 

 Communicated by Professor Ramsay, F.R.S 221 



The Spectrum of a-Aquilte. By Sir Norman Lockyer, K.C.B., F.E.S., 

 and A. Fowler (Plate 1) , 232 



The Velocity of the Ions produced in Gases by Rontgen Rays. By 

 John Zeleny, B.Sc, B.A., Assistant Professor of Physics, University 

 of Minnesota. Conummicated by Professor J. J. Thomson, F.R.S. 238 



Mathematical Contiibutions to the Theory of Evolution. VIII. On 

 the Correlation of Characters not Quantitatively Measurable. By 

 Karl Pearson, F.R.S 241 



Meeting of March 8, 1900 244 



Bakerian Lecture.— On the Specific Heat of Metals and the Relation 

 of Specific Heat to Atomic Weight. By W. A. Tilden, D.Sc, F.R.S., 

 Professor of Chemistry in the Royal College of Science, London. 

 With an Appendix by Professor John Perry, F.R.S 244 



