CONTENTS. 



VOL. LXIX. 



No. 451. 



Page 



A Determination of the Value of the Earth's Magnetic Field in Inter- 

 national Units and a Comparison of the Results with the Value given 

 by the Kew Observatory Standard Instruments. By W. Watson, 

 B.Sc., F.R.S., Assistant Professor of Physics at the Royal College of 

 Science, London 1 



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 H. Gadow, F.R.S 2 



On the Application of Maxwell's Curves to Three-colour Work, with 

 Especial Reference to the Nature of the Inks to be employed, and to 

 the Determination of the Suitable Light-filters. By Reginald S. 

 Clay, B.A., D.Sc.. Communicated by Sir W. de W. Abney, K.C.B., 

 F.R.S 26 



On the Seasonal Variation of Atmospheric Temperature in the British 

 Isles and its Relation to Wind-direction, with a Note on the Effect 

 of Sea Temperature on the Seasonal Variation of Air Temperature. 

 By W. N. Shaw, M.A., F.R.S., Secretary to the Meteorological 

 Council, and R. Waley Cohen. B.A 61 



No. 452. 



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

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

 Oxford 86 



The Anatomy and Development of the Stem in the Pteridophyta and 

 Gymnosperms. By Edward C. Jeffrey, Ph.D., Lecturer in the 

 University of Toronto. Communicated by D. H. Scott, F.R.S 119 



A Memoir on Integral Functions. By E. W. Barnes, M.A., Fellow of 

 Trinity College, Cambridge. Communicated by Professor A. R. 

 Forsyth, Sc.D., F.R.S 121 



On Areal Induction. By George J. Burch, M.A., F.R.S., Reading 

 College, Reading 125 



Further Observations on Nova Persei. No. 4. By Sir Normaii 

 Lockyer, K.C.B F.R.S 133 



