PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



vol. lxviii. No. 448. 



CONTENTS. 



PAGE 



Meeting of June 13, 1901 360 



Bakerian Lecture.— The Nadir of Temperature, and Allied Problems. 

 1. Physical Properties of Liquid and Solid Hydrogen. 2. Separation 

 of Free Hydrogen and other Gases from Air. 3. Electric Eesistance 

 Thermometry at the Boiling Point of Hydrogen. 4. Experiments on 

 the Liquefaction of Helium at the Melting Point of Hydrogen. 5. Pyro- 

 electricity, Phosphorescence, &c. By James Dewar, LL.D., D.Sc., 

 F.E.S., Jaeksonian Professor in the University of Cambridge, and 

 Fullerian Professor of Chemistry, Eoyal Institution, London, &c. . . 360 



Meeting of June 20, 1901, and List of Papers read 366 



On the Mathematical Theory of Errors of Judgment, with Special Bef erence 

 to the Personal Equation. By Karl Pearson, F.B.S., University 

 College, London . . ., . 369 



Mathematical Contributions to the Theory of Evolution. — X. Supplement 

 to a Memoir on Skew Variation. By Karl Pearson, F.E.S., University 

 College, London 372 



On the Structure and Affinities of Dipteris, with Notes on the G-eological 

 History of the Pipteridinse. By A. C. Seward, F.E.S., University 

 Lecturer in Botany, Cambridge, and Elizabeth Dale, Pfeiffer Student, 

 G-irton College, Cambridge 373 



The Nature and Origin of the Poison of Lotus arahicus. By Wyndham 



E. Dunstan, M.A., F.E.S., Director of the Scientific and Technical 

 Department of the Imperial Institute, and T. A. Henry, B.Sc, Salters' 

 Company's Eesearch Fellow in the Laboratories of the Imperial Insti- 

 tute . . . . .374 



The Pharmacology of Pseudaconitine and Japaconitine considered in Eelation 

 to that of Aconitine. By J. Theodore Cash, M.D., F.E S., Eegius 

 Professor of Materia Medica in the University of Aberdeen, and 

 Wyndham E. Dunstan, M.A., F.B.S., Director of the Scientific Depart- 

 ment of the Imperial Institute 378 



The Pharmacology of Pyraconitine and Methylbenzaconine considered in 

 Eelation to their Chemical Constitution. By J. Theodore Cash, M.D., 



F. E.S., Eegius Professor of Materia Medica in the University of Aber- 

 deen, and Wyndham E. Dunstan, M.A., F.E.S., Director of the 

 Scientific Department of the Imperial Institute 384 



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