CONTENTS. 



VOL. XIII. 



PAGE 



On the Dimorphism of the English species of Nummulites. By J. J. Lister 1 

 On a Problem concerning Wood and Lignified cell-walls. By Professor 



H. Marshall Ward 3 



The Pine-apple Gall of the Spruce : a Note on the early stages of its 



development. By E. R. Burdon . . . . . . .12 



Note on some peculiar features in seedlings of Peperomia. By A. W. Hill 20 

 On the dynamical significance of Kundt's laiv of selective dispersion, in 



connexion with the transmission of the energy of trains of dispersive 



waves. By Professor J. Larmor 21 



An attempted Synthesis of Uric Acid. By H. J. H. Fenton ... 25 

 Note on the Diffusion of Hydrogen through Palladium. By 0. W. 



Richardson 27 



Some Optically Active Nitrogen Compounds. By Miss M. B. Thomas and 



H. 0. Jones 33 



On the Inheritance of Tortoiseshell and Related Colours in Cats. 



By L. Doncaster 35 



On the vibrations of atoms containing 4, 5, 6, 7, and 8 corpuscles and 



on the effect of a magnetic field on such vibrations. By Professor 



J. J. Thomson 39 



On the positive electrification of a rays, and the emission of slowly 



moving cathode rays by radio-active substances. By Professor 



J. J. Thomson 49 



Note on a property of orthogonal covariants of a binary quantic. By 



Arthur Berry 55 



Note on the Positive Leak from Hot Platinum in Air at Low Pressures. 



By 0. W. Richardson 58 



Some Methods of Increasing the Spark-Length of the Wimshurst Machine. 



By B. J. Palmer. (Communicated by Prof. J. J. Thomson) . . 60 

 Reduction of Generating Functions by means of Complex Integration. 



By G. B. Mathews 69 



Sol a hie forms of metallic dihydroxy tartrates. By H. J. H. Fenton . 73 

 Studies on Unsaturated Ketonic Compounds. By S. Ruhemann . 76 



