INDEX. 



555 



associated rocks of the neighbour- 

 hood of Oorwen, 148. 

 Lea (M. C.) on the nature of cer- 

 tain solutions and on a new means 

 of investigating them, 88 ; on en- 

 dothermic reactions effected by 

 mechanical force, 351. 

 Lead, on the electrical resistance of, 

 at temperatures approaching the 

 absolute zero, 1:94. 

 Light, the electric-arc standard of,124. 

 Lightning- discharges, on the oscilla- 

 tions of, 543. 

 Lights of different colours, on a 

 photometer for measuring the in- 

 tensities of, 168. 

 Limestones, on the dwindling and 



disappearance of, 146. 

 Liquids, on the flow of viscous, 345 ; 

 on new methods of measuring 

 the surface-tension of, 385 ; on 

 the conducting-power of dielectric, 

 550. 

 Liveing (Prof.) on the refractive in- 

 dicesof liquid nitrogen and air, 328. 

 Lochner (S. J.) on the elongation 

 produced in soft iron by magnetism, 

 498. 

 Lodge (Prof. O. J.) on the founda- 

 tions of dynamics, 1 ; on aberra- 

 tion problems, 549. 

 McAulay (A.) on a modification of 



Maxwell's electrical theory, 175. 

 MacGregor (Prof. J. G.) on the hy- 

 potheses of dynamics, 233. 

 McMahon (Lieut. -Gen. 0. A.), notes 



on Dartmoor, 149. 

 Magnesium, on the electrical resist- 

 ance of, at temperatures approach- 

 ing the absolute zero, 292. 

 Magnetic field close to the surface of 

 a wire conveying an electrical 

 current, on the, 201. 

 Magnetism, on the elongation pro- 

 duced in soft iron by, 498. 

 Matter, on the condition of, near the 



critical point, 552. 

 Maxwell's electrical theory, on a 



modification of, 175. 

 Mayer (A. M.) on the phenomena of 

 simultaneous contrast-colour, and 

 on a photometer for measuring the 

 intensities of lights of different 

 colours, 153. 

 Mechanical force, on endothermic 



reactions effected by, 351. 

 Meniscus, on the disappearance of 

 the, when a liquid is heated under 

 constant volume, 231. 



Metals, on the electrical resistance 

 of, at temperatures approaching 

 the absolute zero, 271. 

 Michell (J. H.) on the highest waves 



in water, 430. 

 Minchin (Prof. G. M.) on the mag- 

 netic field close to the surface of a 

 wire conveying an electrical cur- 

 rent, 201. 

 Molecular force, on the laws of, 150, 

 507. 



Motion, on tlie laws of, 7, 233. 



Myers (J. E.J on a new volumeno- 

 meter, 195. 



Nickel, on the electrical resistance 

 of, at temperatures approaching 

 the absolute zero, 291. 



Nitrogen, on the refractive index of 

 liquid, 328. 



and carbonic acid, on some 



thermal properties of a mixture of, 

 438. 



Palladium, on the electrical resist- 

 ance of, at temperatures approach- 

 ing the absolute zero, 285. 



Parsons (Hon. C. A.) on carbon at 

 high temperatures and under great 

 pressures, 304. 



Paschen (F.) on the emission of 

 heated gases, 551. 



Pendulum actinometer, on a modified 

 form of, 459. 



Perry (Prof.) on long-distance tele- 

 phony, 222. 



Photometer, on a new, 82 ; for 

 measuring the intensities of lights 

 of different colours, on a, 168. 



Photometric method which is inde- 

 pendent of colour, on a, 380. 



Photometry, some notes on, 120. 



Physics, on the methods of theo- 

 retical, 37. 



Pickering (S. U.) on the hydrates of 

 hydrogen bromide, 111. 



Pidgeon (W. R.) on an influence- 

 machine, 267. 



Piezo-electric property of quartz, on 

 the, 331, 384. 



■ pile, on a, 342. 



Piezo-electricity of crystals, on the 

 theory of, 453. 



Platinum, on the electrical resistance 

 of, at temperatures approaching 

 the absolute zero, 281. 



Pole (Dr. W.) on colour-blindness, 



188. 

 Postlethwaite (J.) on an intrusive 

 sheet of diabase at Robin Hood, 

 379. 



