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On the Development of the Layers of the Eetina in the Chink after the 

 Formation of the Optic Cup. By John Cameron, M.B., Ch.B. (Edin.). 

 Communicated by Professor Mcintosh, F.R.S 84 



The Classification of the Elements. By Henry E. Armstrong, V.P.R.S. 86 



Persulphuric Acids. By Henry E. Armstrong, V.P.R.S., and T. Martin 

 Lowry, D.Sc , 94 



The Conditions Determinative of Chemical Change and of Electrical 

 Conduction in Gases, and on the Phenomena of Luminosity. By 

 Henry E. Armstrong. V.P.R.S 99 



No. 461. 



On the Properties of the Arterial and Venous Walls. By J. A. Mac- 

 William, M.D., Regius Professor of Physiology in the University of 

 Aberdeen. Communicated by Sir M. Foster, Sec. R.S 109 



Cyanogenesis in Plants. Part II. — The Great Millet, Sorghum vulgare. 

 By Wyndham R. Dunstan, M.A., F.R.S., Director of the Scientific 

 Department of the Imperial Institute, andT. A. Henry, D.Sc, Lond. 153 



On the Continuity of Effect of Light and Electric Radiation on Matter. 

 By Jagadis Chunder Bose. Communicated by Lord Rayleigh, F.R.S. 154 



On the Similarities between Radiation and Mechanical Strains. By 

 Jagadis Chunder Bose. Communicated by Lord Rayleigh, F.R.S 174 



On the Strain Theory of Photographic Ac. ion. By Jagadis Chunder 



Bose. Communicated by Lord Rayleigh, F.R.S 185 



No. 462. 



On the Interpretation of Photographic Records of the Response of 

 Nerve obtained with the Capillary Electrometer. By George J. 

 Burch, M.A., F.R.S., Physiological Laboratory, Oxford/. 194 



Contributions to a Theory of the Capillary Electrometer. I. — On the 

 Insulation Resistance of the Capillary Electrometer, and the Mini- 

 mum Quantity of Electricity required to produce a Visible Excur- 

 sion. By George J. Burch, M.A., Oxon., F.R.S., Lecturer in Physics, 

 Reading College, Reading " 221 



On a Peculiarity of the Cerebral Commissures in certain Marsupialia, 

 not hitherto recognised as a Distinctive Feature of the Diproto- 

 dontia. By G. Elliot Smith, M.D., Ch.M., Professor of Anatomy, 

 Egyptian Government School of Medicine, Cairo, and Fellow of 

 St, John's College, Cambridge. Communicated by Professor G. B. 

 Howes, F.R.S : 226 



A New Interpretation of the Gastric Organs of Spirula, Nautilus, and 

 the Gastropods. By J. E. S. Moore and W. B. Randies, B.Sc. Com- 

 municated by Professor G. B. Howes, F.R.S 231 



Coefficients of the Cubical Expansion of Ice, Hydrated Salts, Solid 

 Carbonic Acid, and other Substances at Low Temperatures. By 

 James Dewar, M.A., D.Sc, LL.D., Jacksonian Professor, Cambridge 

 University, and Fulierian Professor, Royal Institution, London 237 



