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MATHEMATICS.

M. VALENTINO CERRUTI sur les Mouvements apériodiques des Systèmes de

Points Matériels .............

Professor LUIGI CREMONA sur les Systèmes de Sphères et les Systèmes de

Droites ............

Mr. George H. DARWIN on Graphical Interpolation and Integration ......

Mr. J. W. L. GLAISHER on certain Determinants .......

— on a Series Summation leading to an Expression for

the Theta Function as a Definite Integral ......

Mr. W. HAYDEN on Parallel Motion .............

Mr. HENRY M. JEFFERY on Plane Cubics of the Third Class with a Double

and a Single Focus .........

.........

- on Spherical Class-cubics with Double Foci and

Double Cyclic Arcs. .....

...........

Professor GIUSEPPE JUNG on the Inverse Problems of Moments of Inertia and

of Moments of Resistance ....

- on the Graphical Representation of the Moments

of Resistance of Plane Figures ................... .............

on a new Construction for the Central Nucleus of

a Plane Section ......

........

Professor A. B. W. KENNEDY on Centroids, and their Application to some

Mechanical Problems ...

Professor Paul Mansion on an Elementary Demonstration of a Fundamental

Principle of the Theory of Functions ......

.......

Mr. THOMAS MUIR on Convergents ....

.......
- on the Relation between two continued Fraction Expan-
sions for Series. ................

ries....................................................

Professor F. W. NEWMAN on the Use of Legendre's Scale for Calculating the

First Elliptic Integral ..........

........

Professor P. G. Tait on General Theorems relating to Closed Curves ......

Professor JAMES THOMSON on a Theorem in the Mensuration of certain Solids 30

Mr. W. H. WALENN on Division-remainders in Arithmetic........

Mr. M. M. U. WILKINSON on Many-valued Functions ....................

GENERAL Physics, &c.

Dr. JAMES CROLL on the Transformation of Gravity ......................... 30

Mr. WILLIAM CROOKES on the Influence of the Residual Gas on the Move-

ment of the Radiometer ........

37

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ACOUSTICS.

Mr. R. H. M. BOSANQUET on the Conditions of the Transformation of Pendu-

lum-Vibrations; with an experimental illustration ...

Mr. COLIN BROWN on true Intonation, illustrated by the Voice-Harmonium

with Natural Finger-board.........

Sir W. Thomson on a Practical Method of Tuning a Major Third..........

: : :

: : : :

Mr. E. M. Dixon on an Apparatus for the Analysis of Impurities in the Atmo-

sphere .....................................

Mr. J. DUNNACHIE on Fire-Brick........ ..............................

Mr. A. FERGUSSON on White-Lead...

Professor GAMGEE on the Physiological Action of Pyro-, Meta-, and Ortho-

phosphoric Acids .................................................. 64

Professor GLADSTONE on the Influence of the Condition and Quantity of the

Negative Element on the Action of the Copper-Zinc Couple ............

Professor GUTHRIE on Solid Water ........

.................

Mr. W.N. HARTLEY on the Critical Point of Liquid Carbonic Acid in Minerals 64

Mr.WILLIAM HENDERSON on the History of Copper-extraction by the Wet Way
Colonel HOPE on the Purification of the Clyde .....
Mr. CHARLES T. KINGZETT on the Limited Oxidation of Terpenes.- Part IV.
Mr. A. C. LETts on two new Hydrocarbons from Turpentine ......
Mr. J. MACTEAR on Soda Manufacture ..................... .....
Dr. MACVICAR on the possible Genesis of the Chemical Elements out of a

Homogeneous Cosmic Gas or Common Vapour of Matter.......... ......

Mr. M. M. PATTISON Muir on Essential Oil of Sage.--Part I.

- on the action of Dilute Saline Solutions upon

Lead ..................

-- on certain Compounds of Bismuth .......

..........

Mr. J. A. R. NEWLANDS on Relations among the Atomic Weights of the

Elements ........................

-- on the Alum Process in Sugar-refining.......

Mr. T. L. PATTERSON on Sugar ...
Mr. W. H. PERKIN on some new Anthracene Compounds ......
Dr. WILLIAM RAMSAY on Picoline and its Derivatives ........
Dr. J. EMERSON REYNOLDS on Glucinum, its Atomic Weight and Specific

H eat ....................................
Mr. W. C. SILLAR on the Utilization of Sewage ........
Mr. R. D. SILVA on the Action of Hydriodic Acid on mixed Ethers of the

General Formula CnH2n+1+0.CH: .............

Mr. ANDERSON SMITH on Sodium ................

Mr. EDWARD C.C. STANFORD on the Manufacture of Iodine .....

Mr. J. E. STODDART on Lead Desilverizing by the Zinc Process . .

Mr. J. JOHNSTONE STONEY on the Atomicity of Oxygen and on the Constitu-

tion of Basic Salts .................

Mr. D. Swan on Zinc ........

Rev. R. THOMSon on the Prevention of the Pollution of Rivers .........

Mr. WILLIAM Thomson on the Growth of Mildew in Grey Cloth ......

Dr. W.A. TILDEN on the Nitroso Derivatives of the Terpenes .

- --on a new Iso-purpurine .......

Mr. F. WARD on the Prevention of Fraudulent Alterations in Cheques &c. ....

Mr. WALTER WELDON on the Means of Suppressing Alkali Waste....

Dr. C. R. ALDER WRIGHT on New Cotarnine Derivatives ...

- on the Alkaloids of the Aconites ....

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