INDEX. 



533 



Carmichael (N. K.) on the Kontgen 

 rays, 381. 



Cathetometer, on a simple and accu- 

 rate, 123. 



Cements, on a simple apparatus for 

 determining the thermal conduc- 

 tivities of, 495. 



Chorlton (J. D.) on a simple appa- 

 ratus for determining the thermal 

 conductivities of cements &c, 495. 



Clark (A. L.) on a method of deter- 

 mining the angle of lag, 369. 



Climatology, on some points in geo- 

 logical, 273. 



Coil, on the magnetic field of any 

 cylindrical, 367. 



Cole (R. S.) on graphical methods 

 for lenses, 216. 



Conductivity of mixtures of electro- 

 lytes, on the calculation of the, 

 276, 510. 



Conductors, on the influence of elec- 

 trical waves on the galvanic re- 

 sistance of metallic, 79. 



Copper, action of sulphur-vapour 

 upon, 70. 



David (Prof. T. W. E.) on glacial 

 action in Australia in Permo- 

 carboniferous time, 522. 



Davison (C.) on the straining of the 

 eartli resulting from secular cool- 

 ing, 133. 



Densimeter, on a new, 530. 



Diffusion of metals, on the, 524. 



Dissociation degree of some electro- 

 lytes at0°, on the, 117. 



Earth, on the straining of the, re- 

 sulting from secular cooling, 133. 



Eder (Dr. J. M.) on the spectra of 

 argon, 149. 



Edgeworth (Prof. F. Y.) on the 

 asymmetrical probability-curve, 

 90 ; on the compound law of error, 

 207. 



Elasticity, on the variation of the 

 modulus of, with change of tem- 

 perature, 168. 



Electric arc, on some phenomena of 

 the, 315. 



currents, on the existence of 



vertical earth- air, in the United 

 Kingdom, 99. 



thermometer for low tempera- 

 tures, on a, 312. 



Electrical methods applied to ther- 

 mal determinations, 25. 



Electrical phenomena, on the produc- 

 tion of, by the Kontgen rays, 230. 



waves, on the influence of, on 



the galvanic resistance of metallic 

 conductors, 79 ; on an interference 

 experiment with, 151 ; on the 

 double refraction of, 152 ; on the 

 tinfoil grating detector for, 445. 



Electricity, on the alleged scattering 

 of positive, by light, 437. 



Electrolytes, on the dissociation de- 

 gree of some, at 0°, 117 ; on the 

 calculation of the conductivity of 

 mixtures of, 276, 510. 



Electromagnetic theory of moving 

 charges, on the, 488. 



Electro-optical investigation of po- 

 larized light, 218. 



Elles (G. L.) on the Llandovery and 

 associated rocks of Conway, 147. 



Elster (Prof. J.) on the electro- 

 optical investigation of polarized 

 light, 218 ; on the alleged scat- 

 tering of positive electricity by 

 light, 437. 



Emtage (W. T. A.) on the relation 

 between the brightness of an ob- 

 ject and that of its image, 504. 



Error, on the compound law of, 207. 



Eumorfopoulos (N.) on the determi- 

 nation of high temperatures with 

 the meldometer, 360. 



Everett (Prof. J. D.) on resultant 

 tones, 199. 



Everett (W. H.) on the magnetic 

 field of any cylindrical coil, 367. 



Feilden (Col. H. W.) on the geo- 

 logy of Kolguev Island, 77. 



Flash of exploding oxyhydrogen, on 

 the duration of the, 120. 



Fleming (Prof. J. A.) on the alter- 

 nating-current arc, 315. 



Focal lengths of mirrors and lenses, 

 on a graphical method for finding 

 the, 59, 152, 216, 383. _ 



Focus tubes for producing x-rays, 

 on, 382. 



Freezing-points of dilute solutions, 

 on the, 196. 



Frith (J.) on the effect of wave- 

 form on the alternate-current arc, 

 507. 



Geikie (Sir A.) on the Tertiary 

 basalt-plateaux of N.W. Europe, 

 142. 



Geitel (Prof. H.) on the electro- 



