CONTENTS OF N° b7.—New Series. 



XXI. On Isomorphism. By H. J. Brooke, Esq. F.R,, L.,& G.S. 



page 161 



XXII. Exposition of a New Dynamico-Chemical Principle. By 

 Mr. John James Waterstone 170 



XXIII. An Examination of M. Virey's Observations on Aeronautic 

 Spiders, published in the Bulletin des Sciences Naturelles. By John 

 Blackwall, Esq. F.L.S 180 



XXIV. On Mengite, a new Species of Mineral ; on the Characters 

 of Aeschenite; on Sarcolite, as distinct from Analcime and Gmelinite; 

 with other Mineralogical Notices. By H. J. Brooke, Esq. F.R., L., 



& G.S 187 



XXV. On a New Register- Pyrometer, for Measuring the Expan- 

 sions of Solids, and determining the higlier Degrees of Temperature 

 upon the common Thermometric Scale. By J. Frederic Daniell, 

 Esq. F.R.S. ( With a Plate) ( To be continued) 191 



XXVI. On the Theory of the Compressibility of the Matter com- 

 posing the Nucleus of the Earth, as confirmed by what is known of 

 the EUipticities of the Planets. By the Rev, J. Challis, Fellow of 

 the Cambridge Philosophical Society 200 



XXVII. Analysis of some Salts of Mercury. By R. Phillips, 

 F.R.S. L. & E. &c 205 



XXVIII. Experiments on Vanadiate of Ammonia, and on some 

 other Compounds of Vanadium. By Mr. John Prideaux, Member 



of the Plymouth Institution 209 



XXIX. Notices respecting New Books: — Dr. Paris's Life of Sir 

 Humphry Davy. ( To be continued) 214 



XXX. Proceedings of Learned Societies: — Royal Society; 

 Zoological Society 223-23i 



XXXI. Intelligence and Miscellaneous Articles:— Preparation of 

 Iodic Acid, by Arthur Connell, A.M. ; New Scientific Books; Mr, 

 Saull's Geological Museum ; Occultations of Planets and Fixed Stars 

 by the Moon in September 1831 ; Meteorological Observations for 

 July 1831 ; Table, &c 235-2^ 



It is requested that all Communications for this Work may be addressej 

 post paid, to the Care of Mr. R. Taylor, Printing Office, Red Lion Couij 

 Fleet Street, London,- where complete Sets of the Old Series of the Ph 

 losophical Magazine may be had at half of the original price. 



