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Mr. R. Moon's Remarks on the Analytical Principles of Hy-
drodynamics, in Reply to Professor Challis
143
Dr. Helmholtz on Galvanic Polarization in Liquids free from
Gas
Notices respecting New Books :-
145
Mr. W. T. Pierce's Treatise on Practical Solid or Descrip-
tive Geometry: embracing Orthographic Projection and
Perspective or Radial Projection
153
Prof. M. Yarnall's Catalogue of Stars observed at the
United States Naval Observatory during the years 1845
to 1871 ...
155
On a new Determination of the Mechanical Equivalent of Heat,
by H. Serrano y Fatigati...
On the Expansibility of Ebonite by Heat, by F. Kohlrausch.. 156
On the Discharge of Electrified Conductors, by J. Moutier.. 157
NUMBER CCCXI.—MARCH.
The Earl of Rosse on the Electric Resistance of Selenium .. 161
Mr. J. A. Phillips on the Composition of certain Mine Waters. 164
Mr. J. Croll on the Physical Cause of Ocean-currents. (With
a Plate.)..
... 168
... 190
M. H. Herwig on the Number and Weight of the Molecules
of Ether contained in Electric Conductors
Lord Rayleigh on the Manufacture and Theory of Diffraction-
gratings...
... 193
M. J. L. Soret on some Phenomena of Polarization by Diffusion
of Light..
... 205
M. A. Terquem on the Transformation of the Vibroscope into
a Tonometer, and its employment for the Determination of
the Absolute Number of Vibrations
Notices respecting New Books :—
212
The Rev. S. Hawtrey's Introduction to the Elements of
Euclid
215
Proceedings of the Royal Society:-
Lieut. Sale on the Action of Light on the Electrical Re-
sistance of Selenium . . .
216
Mr. D. M Kichan's Determination of the Number of
Electrostatic Units in the Electromagnetic Unit .... 218
Messrs. Stewart and Tait on the Heating of a Disk by
rapid Rotation in vacuo...
Mr. F. Chambers on the Diurnal Variations of the Wind
and Barometric Pressure at Bombay
Proceedings of the Geological Society:-
219
.. 228
Dr. J. Bryce on the Jurassic Rocks of Skye and Raasay. 229
Mr. D. Mackintosh on the more remarkable Boulders of
the North-west of England and the Welsh Borders .. 230
Mr. T. Davidson on some Brachiopoda collected by Mr.
Judd from the Jurassic Deposits of the East Coast of
Scotland. . . . .
230
Prof. D. T. Ansted on Solfataras and deposits of Sulphur
at Kalamaki
Mr. J. Lucas on the Origin of Clay-Ironstone
231
Dr. Dawson on Leptophloum rhombicum and Lepidoden-
dron gaspianum . . .
Capt. F. W. Hutton on the younger formations of New
Zealand
232
Mr. W. Carruthers on the Tree Ferns of the Coal-mea-
sures
233
Mr. A. H. Schindler on the Geology of Kazirùn
The Rev. T. G. Bonney on the Lakes of the North-eastern
Alps
234
Signor B. Gastaldi on the Effects of Glacier-erosion in
Alpine Valleys
235
On the Limits of the effective Power of Microscopes, by Pro-
fessor Helmholtz
236
Experimental Researches on Newton's Coloured Rings, by P.
Desains
On extraordinary developments of Light in the grinding of
hard Stones, by Dr. Jacob Nöggerath
237
NUMBER CCCXII.-APRIL.
Prof. J. P. Cooke on the Vermiculites; their Crystallographic
and Chemical Relations to the Micas; together with a dis-
cussion of the Cause of the Variation of the Optical Angle in
these Minerals (With a Plate.)
241
M. H. Vogel on the Sensibility to Light of Bromide of Silver
with respect to the so-called Chemically Inert Colours .... 273
Prof. Challis on the Effects produced by Fog and Vapour in
the Atmosphere on the Intensity of Sound
.. 277
M. G. Lippmann on the Connexion between Capillary and
Electrical Phenomena. (With a Plate.)
281
Mr. R. Moon on the Measure of Work in the Theory of Energy. 291
M. F. Kohlrausch on the Determination of the Absolute Value
of the Siemens Mercury Unit of Electrical Resistance .... 294
Sir B. C. Brodie on the Electric Decomposition of Car-
bonic-Acid Gas
309
Messrs. Lockyer and Roberts on the Quantitative Ana-
lysis of certain Alloys by means of the Spectroscope.. 311
Mr. J. A. Broun on the Period of Hemispherical Excess
of Sun-spots, and the 26-day Period of Terrestrial
Magnetism.
311
Proceedings of the Geological Society :-
Prof. E. Hull on the Permian Breccias and Boulder-beds
of Armagh....
313
Mr. G. W. Stow's Geological Notes on Griqualand West. 313
Prof. T. R. Jones on some Bivalve Entomostraca, chiefly
Cypridinidæ, of the Carboniferous formations
314
315
On the Permanent Magnetism of Steel, by E. Bouty
Contribution to the Theory of the Magnetic Forces, by M. Stefan. 318
On a peculiar Occurrence of Crystallized Silicic Acid, by Theodor
Hübener
319
On the Spectrum of the Light of Exploding Gun-cotton, by
O. Lohse
Dr. J. H. v. Mädler
320
NUMBER CCCXIII.-MAY.
M. G. Quincke on the Determination of the prime Angle of
Incidence and prime Azimuth for the different Fraunhofer's
Lines
.. 321
331
Mr. T. Muir on Sylvester's and other forms of continued
Fraction for Circle-quadrature..
Mr. J. Dewar on the Physical Constants of Hydrogenium
M. F. Kohlrausch on the Absolute Value of the Siemens
Mercury Unit of Electrical Resistance. (With a Plate.)
Direct Solution of a Geometrical Problem ...
334
342
354
Captain J. Herschel on a new form of Calendar, by which the
Year, or Month, or Month-day, or Week-day may be readily
found when the other three components of a date are given. 357
Dr. W. B. Carpenter on the Physical Cause of Ocean-currents. 359
M. F. Kohlrausch on a Variation-Barometer. (With a Plate.) 362
Notices respecting New Books:-
Prof. P. G. Tait's Elementary Treatise on Quaternions.. 364
Mr. T. Muir on the Expression of a Quadratic Surd as
a continued fraction
366
Mr. R. A. Proctor on the Universe and the Coming Tran-
sits
367
Mr. C. C. Reeks's Elementary Astronomy
374
Proceedings of the Royal Institution :-
Professor Tyndall on the Acoustic Transparency and Opa-
city of the Atmosphere...
Proceedings of the Royal Society:---
Mr. J. N. Lockyer's Researches in Spectrum-Analysis in
connexion with the Spectrum of the Sun.-Part III... 384
Mr. J. Clerk Maxwell on Double Refraction in a Viscous
Fluid in motion
390
Calorific Effects of the Magnetism in an Electromagnet with
several Poles, by A. Cazin
392
Experimental Researches leading to a Determination of the
Temperature of the Sun, by Father A. Secchi
On Hydrogenized Palladium, by MM. L. Troost and P. Haute-
feuille
394
397
NUMBER CCCXIV.-JUNE.
Mr. J. A. Fleming on the new Contact Theory of the Galvanic
Cell..
401
Prof. Ketteler on the Boundary-Conditions of Reflection and
Refraction for the Principal Section of Media in motion . . 411
Mr. T. T. P. B. Warren on a Method of finding Faults in In-
sulated Wires..
Lord Rayleigh on the Theory of Resonators
416
419
Mr. O. Heaviside on Telegraphic Signalling with Condensers. 426
Mr. J. Croll on the Physical Cause of Ocean-currents
Mr. J. W. L. Glaisher on the Verification of an Elliptic
Transcendent Identity ...
434
437
Prof. Cayley on the Mathematical Theory of Isomers
444
Prof. J. Thomson on certain Relations between the
Gaseous, the Liquid, and the Solid States of Water-
Substance
447
Prof. P. M. Duncan on the genus Palæocoryne, and its
affinities.
457
Mr. J. R. Mortimer on Structure in the Chalk of the
Yorkshire Wolds
Sir Philip de Malpas Grey-Egerton on Platysiagum scle-
rocephalum and Palæospinax priscus
458
Dr. T. Wright on a new genus of Silurian Asteriadæ
Mr. J. C. Ward on the Glaciation of the Northern part
of the Lake-district
Mr. F. Drew on the Alluvial and Lacustrine Deposits and
Alluvial Records of the Upper Indus Basin
459
Mr. W. T. Blanford on the Superficial Deposits in the
Valleys and Deserts of Central Persia...
461
Prof. P. M. Duncan on Caryophyllia Bredai, from the
Red Crag of Woodbridge
Mr. J. Buckman on the Cephalopoda-bed and the Oolite
Sands of Dorset and part of Somerset
Mr. H. G. Seeley on Cetarthrosaurus Walkeri, an Ichthyo-
saurian from the Cambridge Upper Greensand ....
Some Experiments on the effects of Magnetism on the Electric
Discharge through a Rarefied Gas when it takes place in
462
the prolongation of the axis of the Magnet, by MM. Auguste
de la Rive and Edouard Sarasin
Experiments on Apparent Adhesion, by M. Stefan
465
On a Spark-adjuster for the Holtz Machine, by James J.
Minot.
467
Index
468
PLATES.
I. Illustrative of Mr. J. Y. Buchanan's Paper on an Apparatus for Gas-
Analysis.
II. Illustrative of Mr. J. Croll's Paper on the Physical Cause of Ocean-
currents.
III. Illustrative of Prof. J. P. Cooke's Paper on the Vermiculites, and M. G. Lippmann's on the Connexion between Capillary and Elec- trical Phenomena.
IV. Illustrative of M. F. Kohlrausch's Papers :-on the Determination of
the Absolute Value of the Siemens Mercury Unit of Electrical
Resistance; and on a Variation-Barometer.