V 



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On the Structure and Affinities of Fossil Plants from the Palaeozoic 

 Rocks. IV. The Seed-like Fructification of Lepidocarpon, a Genus 

 of Lycopodiaceous Cones from the Carboniferous Formation. By 

 D. H. Scott, M.A., Ph.D., F.R.S., Hon. Keeper of the Jodrell 

 Laboratory, Royal Gardens, Kew 117 



On the Theory of Consistence of Logical Class-frequencies and its Geo- 

 metrical Representation. By G. Udny Yule, formerly Assistant Pro- 

 fessor of Applied Mathematics in University College, London. 

 Communicated by Professor K. Pearson, F.R.S 118 



The N ew Star in Perseus. — Preliminary Note. By Sir Norman Lockyer, 

 K.C.B., F.R.S 119 



No. 444. 



Meeting of March 7, 1901, and List of Candidates , 124 



List of Papers read 1 25 



On the Conductivity of Gases under the Becquerel Rays. By the Hon. 

 R. J. Strutr, Fellow of Trinity College, Cambridge. Communicated 

 by Lord Rayleigh, F.R.S * 126 



Some Physical Properties of Nitric Acid Solutions. By V. H. Veley, 

 F.R.S., and J. J. Manley, Daubeny Curator, Magdalen College, 

 Oxford 128 



The Anatomy of Symmetrical Double Monstrosities in the Trout. By 

 James F. Gemmill, M.A., M.D., Lecturer in Embryology and Uni- 

 versity Assistant in Anatomy, Universitv of Glasgow. Communi- 

 cated by Professor Cleland, F.R.S 129 



Preliminary Communication on the CEstrous Cycle and the Formation of 

 the Corpus Luteum in the Sheep. By F. H. A. Marshall, B. A. Com- 

 municated by Professor J. C. Ewart, F.R.S 135 



On the Composition and Variations of the Pelvic Plexus in Acanthias 

 vulgaris. By R. C. Punnett, B.A., Gonville and Caius College, Cam- 

 bridge. Communicated by Dr. H. Gadow, F.R.S 140 



Further Observations on Nova Persei. By Sir Norman Lockyer, K.C.B., 

 F.R.S. (Plate 1) 142 



Meeting of March 14, 1901, and List of Papers read 146 



The Action of Magnetised Electrodes upon Electrical Discharge 

 Phenomena in Rarefied Gases. By C. E. S. Phillips. Communicated 

 by Sir William Crookes, F.R.S 147 



The Chemistry of Nerve-degeneration. Bv F. W. Mott, M.D., F.R.S., 

 and W. D. Halliburton, M.D., F.R.S 149 



On the Ionisation of Atmospheric Air. By C. T. R. Wilson, M.A., 

 F.R.S., Fellow of Sidney Sussex College, Cambridge , 151 



On the Preparation of Large Quantities of Tellurium. By Edward 

 Matthey, A.R.S.M. Communicated by Sir George Stokes, Bart., 

 F.R.S 161 



