Vlll CONTENTS. 



On the Irish Coins of Edward IV. By Aquilla Smith, M.D. page 367 



Remarks on the Oxidating Power of Glass for Metals. By George 

 J. Knox, Esq 369 



Notice of a Gaseous Compound of Fluorine and Cyanogen. By 

 George J. Knox, Esq 371 



On the Dynamical Theory of Crystalline Reflexion and Refraction. 

 By Jam'es Mac Cullagh, LL.D 3/4 



Notice respecting Meteor-paper. By the Rev. Humphrey Lloyd, A.M. 379 



On Porcelain Seals found in Ireland. By J. Huband Smith, Esq. . 380 



On ancient Irish Seals. By George Petri e, Esq 382 



On the Optical Laws of Quartz. By James Mac CuUagh, LL.D. . 385 



An Inquiry into the Period of the first Use of the Zero. By 

 James O. Halliwell, Esq 386, 417 



On the Querns used by the Irish. By J. Huband Smith, Esq. . . 390 



On the Magnetizing Power of the more refrangible Solar Rays. By 

 George J. Knox, Esq. and the Rev. Thomas Knox 393 



Report of Council for the past Year 396 



On a new Air Thermometer. By Wrigly Grimshaw, Esq. . . . 405 



On an essential Oil obtained during the Rectification of Whiskey. 

 By James Apjohn, M.D 407 



Account for the Year ending 3 1st of March, 1840 413 



Remarks on the Indications of the Barometer. By the Archbishop 

 of Dublin 414 



On the Boetian Numerical Notation. By James O. Halliwell, Esq. 415 



On the Animal Remains and Antiquities found at Dunshaughlin. 

 By William R. Wylde, Esq 420 



Remarks on Aristotle's History of Animals. By Jonathan 

 Osborne, M.D 427 



Notice of an African Gold Ring. By the R«v. James H. Todd, B.D. 430 



On the Value of the Numerical Coefficient in the Formula for 

 the Force of Aqueous Vapour in the Atmosphere.* By James 

 Apjohn, M.D., and the Rev. Humphrey Lloyd, A.M 433 



On a Manuscript, called the Book of Lismore. By the Rev. James 

 H.Todd, B.D 449,458" 



Notes on the Aurora of the 24th April, 1840. By John Ball, Esq. , 451 



Notice of Meteor Paper found in Gloucestershire. By the Rev. 

 Thomas R. Robinson, D.D 454 



On the comparative Amount of Rain at Toomavara, County of Tip- 

 perary, and at Monks' Eleigh, Suffolk. By the Rev. Thomas 

 Knox, and Rev. Henry B. Knox 455 



Account of Observations of Magnetic Declination, made by Pro- 

 fessors Bache and Lloyd, with the View of determining Differences 

 of Longitude. By the Rev. Humphrey Lloyd, A.M 459 



* The third of the tables of the elastic force of vapour, referred to in this 

 communication, pp. 443, 444, has been erroneously attributed to Mr. Lubbock. 



