Contents. 



On the synthesis of carboxy derivatives of pyridine. By W. J. Sell 



and F. W. Dootson 93 



Experiments illustrating new reactions for the identification of Urea and 



of Primary Amines. By H. J. H. Fenton 96 



A rapid method of estimating sugar. By T. B. Wood and R. A. Berry 97 



Selection of seed by chemical methods. By T. B. Wood and R. A. Berry 98 



Modes of Formation of Osones. By R. S. Morrell and J. M. Crofts 115 



Note on the Stereochemistry of Benzene. By H. O. Jones and J. Kewley 122 



A Method of detecting Nickel and Cobalt in the presence of each other. 



By F. W. Dootson 125 



On the Joule-Thomson Effect. By P. V. Bevan 127 



On a Sensitive Gold-Leaf Electrometer. By C. T. R. Wilson . . 135 



The Origin of the Thorough-bred Horse. By Prof. Ridgeway. (Commu- 

 nicated by Mr A. E. Shipley) . . . . • . . . .141 



The Theory of the Rate of Recombination of Ions in Oases. By O. W. 



Richardson 144 



On Mendelian Heredity of three characters allelomorphic to each other. 



By W. Bateson 153 



On the Difference of Potential between the Terminals of a Vacuum Tube. 



By W. A. D. Rudge 155 



The determination of curves satisfying given conditions. By H. Bateman. 163 



On the Existence of a Radio-active Gas in the Cambridge Tap-water. By 



Prof. Thomson 172 



On the continuous spectrum. By T. H. Havelock. (Communicated by 



Prof. Thomson) 175 



Experiments on the Thomson Effect in Alloys of Bismuth and Tin. By 



S. C. Laws 179 



A Preliminary Account of an Investigation of the effect of Temperature 

 on the Ionization produced in Gases by the action of Rbntgen Rays. 

 By R. K. McClung 191 



A Coleopterous Insect embedded in the tvall of the Human Intestine. By 



D. Sharp 199 



On the influence of Electrons on Colloidal solutions. By W. B. Hardy . 201 



On a method of estimating the amounts of the oxides of Didymium and 

 Erbium by means of the absorption bands of their solutions and its 

 application to other solutions. By J. E. Purvis .... 202 



On the influence of great dilution on the absorption spectra of highly con- 

 centrated solutions of the nitrates and chlorides of Didymmm and 

 Erbium. (With Plates I. and II.) By J. E. Purvis . . .206 



A Lecture Experiment to illustrate the effect of a straight current on 



a magnetic pole. By P. V. Bevan . . . . . .212 



Irreversible simidtaneous linear reactions. By H. 0. Jones and 0. W. 



Richardson 215 



The Estimation of Hydroxylamine (Preliminary Note). By H. 0. Jones 



and F. W. Carpenter . . . ', , . . . 218 



