VI CONTENTS. 



NOTICES AND ABSTRACTS 



OF 



MISCELLANEOUS COxMMUNICATIONS TO THE SECTIONS. 



MATHEMATICS and PHYSICS. 



Mathematics. 



Page 



Mr. AxEXANDKB J. Ellis on Plane Stigmatics 1 



— ■ — on Practical Hypsometry 1 



Dr. J. D. Everett's description of a New Proportion-Table, equivalent to a 

 Sliding-rule 13 feet 4 inches long 2 



Mr. F. P. Fellows on cei-tain Eri'ors in the received Equivalent of the Metre, 

 &c 2 



Professor R. IIarley on Tscliirnhausen's Method of Transformation of Alge- 

 braic Equations, and some of its Modem Extensions 2 



• — - on Differential Resolvents 2 



"s Remarks on Boole's Mathematical Analysis of Logic . . 3 



Dr. PLtJCKEB on Complexes of the Second Order 6 



Mr. W. H. L. Russell on the Hyperelliptic Functions, Giipel and Weirstrass's 

 Systems (3 



Mr. H. J. S. Smith on a Property of Surfaces of the Second Order (j 



'■ on the large Prime Number calculated by Mr. Banatt Davis (5 



Mr. G. J. Stoney on a Nomenclature for Multiples and Submultiples to render 

 absolute Standards convenient in practice, and on the fundamental Unit of 

 Mass G 



Mr. Charles M. Willich on the Partition of the Cube, and some of the 

 Combinations of its parts 7 



Mr. J. R. Hind's Remarks on the Variable Star lately discovered in Corona 

 Borealis 8 



Light. 



Mr. A. Claudet on Optics of Photography. — On a New Process for equalizing 

 the Definition of all the Planes of a Solid Figure represented in a Photogi-a- 

 phic Picture. Means of producing Harmonious and Artistic Portraits .... 



M. a. Cornu on a New Geometrical Theorem relative to the Theoiy of Re- 

 flexion and Refraction of Polarized Light (Isotropic Media) '.) 



Dr. J. H. Gladstone and the Rev. T. P. Dale on Dispersion-equivalents . . 10 



