vi Contents. 



PAGE 



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 



megalospheric 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. Doncaster . . . 103 

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



By the Rev. 0. Fisher 106 



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 



Note on some Physical Properties of Sodium Vapour. By P. V. 



Bevan . 129 



A Null Method of Measuring Small lonisations. By Norman R. 



Campbell i 132 



On the Reflection of Sound at a Paraboloid. Part II. By the Rev. 



H. J. Sharpe 133 



The Abortive Development of the Pollen in certain Sweet- Peas (Lathyrus 



odoratus). (With Plates I. and II.) By R. P. Gregory . . 148 

 The seed-bearing habit in the Lyginodendrew. By E. A. Newell Arber 158 

 Experiments on Penetrating Radiation. By H. L. Cooke . . . 160 

 A suggestion as to the nature of the "walnut" comb in Fowls. By 



W. Bateson and R. C. Punnett 165 



The Absence of Isomerism in substituted Ammonium Compounds. By 



H. 0. Jones 169 



The rate of recombination and the size of gaseous ions. By Professor 



J. J. Thomson . . 170 



Proceedings at the Meetings held during the Session 1904 — 1905 . 174 

 On a Well-sinking, at Craveley, near Huntingdon. By the Rev. 0. 



Fisher 181 



On a Portable Gold-leaf Electrometer for Low or High Potentials, and 



its application to Measurements in Atmospheric Electricity. By 



C. T. R. Wilson 184 



