CONTENTS. 



PAGE • 



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 Presstwes. 

 By 0. W. Richardson 



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



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



Reduction of Generating Functions by means of Complex Integration. 



By Gr. B. Mathews ... ... . .69 



Soluble forms of metallic dihydroxytartrates. By H. J. H. Fenton . 73 



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



Some Compounds of Ouanidine with Sugars. By R. S. Morrell and 



A. E. Bellars . .'....'/. . . . . .79 



The influence of very strong electro-magnetic fields on the spark spectra of 



gold, antimony, bismuth, lead, and tin. By J. E. Purvis . . 82 



On the relation in size between the megalosphere and the microspheric and 



tnegalospheric tests in the Nummulites, By J. J. Lister . . . 92 



The old Moraines of South Victoria Land, By H. T. Ferrar. (Com- 

 municated by A. E. Shipley) . 94 



Notes on a Collection of Parasites belonging to the Museum of University 



College, Dundee. By A. E. Shipley 95 



On the Maturation and Early Development of the Unfertilized Egg in 



certain Sawflies (Tenthredinidae). By L. Donc aster . . . 103 



Densities of the Earth's Crust beneath continents and oceans compared. 



By Rev. 0. Fisher . ]06 



The Chlorination of Methyl derivatives of Pyridine. Part I: 2-Methyl 



Pyridine. By W.J. Sell . . . . ... .119 



Do the y rays carry a charge of negative electricity ? By Prof. J. J. 



Thomson . . . . . . . . . -. . . 121 



On the absence of excited radio-activity due to temporary exposure to 



y rays. By Prof. J. J. Thomson . . . . . . .124 



On the absence of excited radio-activity due to temporary exposure to 

 y rays. By Prof. H. A. Bumstead. (Communicated by Prof. 

 J. J. Thomson) ,-'. . . . . . . . .125 



