392 Royal Society, 



Royal. Communicated by the Astronomer Royal. — Extract 

 of a Letter from the Rev. John Brinkley, D.D. F.R.S. 

 Andrews Professor of Astronomy in the University of 

 Dublin, to the Rev. Nevil Maskelyne, D.D. F.R.S. Astro- 

 nomer Royal, on the annual Parallax of a Lyrae. — On the 

 Mode of Breeding of the Oviviviparous Shark, and on the 

 Aeration of the foetal Blood in different Classes of Animals. 

 By Everard Home, Esq F.R.S. — On Cystic Oxide, a new 

 Species of Urinary Calculus. By William Hyde Wol- 

 laston, M.D. Sec. R.S. — Researches on the oxymuriatic 

 Acid, its Nature and Combinations ; and on the Elements 

 of the muriatic Acid. With some Experiments on Sulphur 

 and Phosphorus, made in the Laboratory of the Roval In- 

 stitution. By H. Davy, Esq. Sec. R.S. Prof. Chem. R.I. 

 F.R.S. E. — Observations upon Luminous Animals. By J. 

 Macartney, Esq. Communicated by Everard Home, Esq. 

 F.R.S. — Observations and Experiments on Pus. By Geo. 

 Pearson, M.D. F.R S. — Presents received by the Royal So- 

 ciety from November 180Q to July 1810. 



GEOGRAPHY. 



Mr. Myers, of the Royal Military Academy, will shortly 

 complete an Introduction to Historical, Physical, and Poli- 

 tical Geography; accompanied with Maps, and adapted to 

 the higher Classes of Pupils, under both public and private 

 Tuition. Mr. M.'s inducement to the undertaking, and his 

 guide in its accomplishment, has been utility ; and to at- 

 tain this object he has condensed into one moderate-sized 

 Octavo Volume the most valuable matter of more extensive 

 Systems. In the construction of the Maps, particular 

 attention is paid to simplicity, perspicuity, and accuracy; 

 and it is presumed that these qualities, so essential in every 

 elementary Treatise, will be found to prevail, in a superior 

 degree, throughout the whole performance. 



LXXII. Proceedings of Learned Societies. 



ROYAL SOCIETY. 



vJn the 22d of Nov. Dr. Wollaston read a paper iC On 

 some of the Combinations of oxymuriatic Gas and Oxygen, 

 and on the Chemical Relations of these Principles to 

 inflammable Bodies. " By H. Davy, Esq. Sec. R.S. 



In this paper Mr. Davy details a great number of experi- 

 ments which he has made on the combinations of oxymu- 

 riatic gas and oxygen with the metals of the fixed alkalies, 

 the metals of the earths, and the common metals j with a 



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