68i 



INDEX. 



planes, cones and cylinders to algebraical 



surfaces, 425. 

 Weld (C. R.) on the invention of fluxions, 



35. 

 "Wilson (Dr. G.) on the decomposition of 



water by platinum and the black oxide 



of iron at a white heat, 177. 

 Young (Prof. J. R.) on the extension of 



Euler's theorem, 123 ; on the principle 

 of continuity in reference to certain re- 

 sults of analysis, 137. 



Xyloidine, contributions to the chemical 

 history of, 519. 



Zantedeschi (Prof.) on the motions pre- 

 sented by flame when under the electro- 

 magnetic influence, 421. . 



END OF THE THIRTY-FIRST VOLUME. 



PRINTED BY RICHARD AND JOHN E. TAYLOR, 



RED LION COURT, FLEET STREET. 



FLAMMAM. 



