vi CONTENTS. 
NOTICES AND ABSTRACTS 
OF 
MISCELLANEOUS COMMUNICATIONS TO THE SECTIONS. 
MATHEMATICS anp PHYSICS. 
Martuemarics. 
Page 
Address by Professor W. J. Macquorn Ranging, LL.D., F.R.S., President 
AED EMSECLIOM! fs ieeieierc'ale soit eioleielstlsss 1b ayeislle volels eles elo.nla) efecnitiels neti mUaCiatele 
Mr. W. H. L. RussExu on a certain Class of Mathematical Symbols........ 
Professor SYLVESTER on the Quantity and Centre of Gravity of Figures given 
in Perspective, or Homography...........0eceeeseeeeercceterceereres 
Mr. J. J. WALKER on the Conditions of the Resolvability of Homogeneous 
Algebraical Polynomials into Factors .........: sec eee eee e eee eens 
ASTRONOMY. 
Mr. STEPHEN ALEXANDER on the Augmentation of the Apparent Diameter of 
a Body by its Atmospheric Refraction. ..........cceeeeeeeeeeee erences 
Mr. W. R. Birt on the Selenographical Relations between the Chain of Lunar 
Mountains the Alps with the Mare Imbrium and the Mare Frigoris. (Com- 
municated by, Dr. TuEE.)... 222%. ote 62 sie o's.sine os ojo vielen «nein Bele iae chee s 
Mr. R. S. Brownz on the relative Distances of the Planets from the Sun 
Mr. A. CxaAupET on the Star Chromatoscope. ... 0.00.20 vcuaceemecnceee 
Rey. Dr. E. Hrycxs on the Relationship between the Variation of the Excen- 
tricity of the Earth’s Orbit and the Moon’s Mean Motion in Longitude. ... 
Description of a Solar Eyepiece invented by the Rey. W. R. Dawes. (Com- 
pay resb (ery ratal ahd Dad D2 ota VE 5 crs Oar cH DO Oe Cod yay MOI ry or Sone 
Dr. Lex on the Lunar “Mare Smythii,” the walled Plain “ Rosse,” the “ Perey 
Mountains,” and the newly named Craters, ‘ Phillips,” “ Wrottesley,” 
CO heyallliter-? xd yee MAA ZU UNV LINE vaiarayore/esols ios bio(ors .'s. 0) 6°0)a,01 0/01 ae tegseearets 
Mr. J. J. Murpuy on the Distribution of Heat on the Sun’s Surface, and the 
(Often asinine died) 4p AOU OROOD SC OOROOT OOO TOON OOO a 2cci-c- 
Professor Puinires’s Researches on the Moon ..........0eesseeeeeeeeees 
Professor C. Prazzt SmytTH on the Changing Colour of the Star 95 Herculis. . 
My. B. Stewart on Sun-spots and their connexion with Planetary Configu- 
IOS os Sioa s acne aE NG 4 sino a,x 20> Win, eae Gani einen 
