465 



INDEX to VOL. XL. 



ixERIAL vibrations in pipes of va- 

 rious forms, on the, 211. 



Aldis (T. S.) on spiral nebulae, 389. 



Ammonia, on the estimation of, in at- 

 mospheric air, 54. 



Andre (F.) on the velocity of the pro- 

 pagation of sound in water, 76. 



Atmosphere, on the estimation of am- 

 monia in the, 54. 



Aurora borealis, on a possible cause 

 of the bright line observed by M. 



Angstrom in the spectrum of the, 



33. 

 Ball (J.) on the cause of the descent 



of glaciers, 1 . 

 Barlow (W. H.) on the cause and 



theoretic value of the resistance 



of flexure in beams, 130. 

 Beams, on the theory of continuous, 



446, 457. 

 Bezold (Prof. Von) on the electrical 



discharge, 42. 

 Bleekrode (Dr. L.) on the influence 



of heat on electromotive force, 310. 

 Bottger (R.) on the preparation of 



a liquid for producing Plateau's 



figures, 392. 

 Books, new : — Tyndall's Researches 



on Diamagnetism, 301 ; Goodeve's 



Elements of Mechanism, 445. 

 Broughton (J.) on the chemical cha- 

 racteristics of the various parts of 



the Cinchona plant, 379. 

 Brown (H. T.) on the estimation of 



ammonia in atmospheric air, 54. 

 Cailletet (L.) on the compressibility 



of gases under high pressures, 146. 

 Calorimetry, on the use of the elec- 

 tric current in, 142. 

 Carbon, on the spectra of, 100. 

 Carbonic oxide, on the rapidity of the 



absorption of, by the lungs, 150. 

 Cayley (Prof.) on the geodesic lines 



on an oblate spheroid, 329. 

 Cazin (A.) on the duration of the 



electric spark, 78 ; on internal work 



in gases, 81, 197, 268. 



Phil. Mag. S. 4. Vol. 40. N 



Chemistry, on statical and dynamical 

 ideas in, 259. 



Cinchona?, experiments on living, 

 379. 



Clausius (Prof. R.) on a mechanical 

 theorem applicable to heat, 122. 



Cometary orbits, on the probable cha- 

 racter of, 183. 



Comets, on a theory of, 300. 



Contour-lines, on the forms of, 421. 



Corona, is the, a solar or terrestrial 

 phenomenon? 117. 



Croll (J.) on the cause of the motion 

 of glaciers, 153; on the physical 

 cause of ocean-currents, 233. 



Davis (A. S.) on the bright line ob- 

 served by M. Angstrom in the spec- 

 trum of the aurora borealis, 33; on 

 the probable character of cometary 

 orbits, 183 ; on a theory of nebulae 

 and comets, 300. 



Davis (J. E.) on deep-sea thermome- 

 ters, 132. 



Dawson (Dr. J. W.) on the structure 

 and affinities of Sigillaria, Cata- 

 mites, and Calamodendron, 384. 



De la Rive (Prof. A.) on the magnetic 

 rotatory polarization of liquids, 393. 



De La Rue (Dr. W.) on solar physics, 

 53. 



Delaunay (M.) on the late Mr. Hop- 

 kins's method of determining the 

 thickness of the earth's crust, 10. 



Dinosauria, on the classification of 

 the, 70. 



Douglas (J. C.) on a new optometer, 

 340. 



Duncan (Dr. P. M.) on the physical 

 geography of Western Europe 

 during the mesozoic and cainozoic 

 periods, 71 • 



Earth, on the method of determining 

 the thickness of the crust of the, 

 by the precession and nutation of 

 the axis of the, 10 ; on supra-annual 

 cycles of temperature in the sur- 

 face-crust of the, 58. 



o. 269. T)pc, 1870. 2 I 



