I'll 



Armour-plate Defences ; — Extracts, relating to the Observatory at Kew, from a Report 

 presented to the Portuguese Government, by Dr. J. A. de Souza; — H. T. Mennell, Report 

 on the Dredging of the Northumberland Coa^it and Dogger Bank; — Dr. Cuthbert Colling- 

 wood, Report upon the best means of advancing Science through the agency of the Mercan- 

 tile Marine; — >Iessrs. Williamson, Wheatstnne, Thomson, Miller, Matthiessen, and Jenkin, 

 Provisional Report on Standards of Electrical Resistance ; — Preliminary Report of the Com- 

 mittee for investigating the Chemical and Mineralogical Composition of tlie Granites of Do- 

 negal ; — Prof. H. Hennessy, on the Vertical Movements of the Atmosphere considered in 

 connexion with Storms and Changes of Weather; — Report of Committee on the application 

 of Gauss's General Theory of Terrestrial M-ignetism to the Magnetic Variations; — Fleeming 

 Jenkin, on Thermo-electric Currents in Circuits of one Metal ;— W. Fairbairn, on the Me- 

 chanical Properties of Iron Projectiles at High Velocities; — .-V. Cayley, Report on the Pro- 

 gress of the Solution of certain Special Problems of Dynamics; — Prof. G. G. Stokes, Report 

 on Doulile Refraction ; — Fourth Report of the Committee on Steamship Performance ; — 

 G. J. Symons, on the Fall of Rain \\\ the British Isles in 1860 and 1861 ; — J. Ball,onTher- 

 mometric Observations in the Alps ; — J. G. JeflFreys, Report of the Committee for Dredging 

 on the N.and E. Coasts of Scotland ; — Report of the Committee on Technical and Scientific 

 Evidence in Courts of Law ; — James Glaisher, Account of Eight Balloon Ascents in 1862 ; — ■ 

 Prof. H. J. S. Smith, Report on the Theory of Numbers, Part IV. 



Together with the Transactions of the Secti(ms, the Rev. Prof. R. Willis's Address, and 

 Recommendations of the Association and its Committees. 

 -« 



PROCEEDINGS of the THIRTY-THIRD MEETING, at New- 

 castle-upon-Tyne, August and September 1865?, PuhUshed at £\ 5s. 



Contents : — Report of the Committee on the Application of Gun-cotton to Warlike Pur- 

 pi^ses; — A. Mattbiessen, Report on the Chemical Nature of AUojs; — Report of the Com- 

 raittre on the Chemical and Mineralogical Constitution of the Granites of Donesai, and of 

 the Rocks associated with them; — J. G. Jeffreys, Report of the Committee iippointed for 

 Exploring the Coasts of Shetland by means of the Dredge; — G. D. Gibb, Report on the 

 Physiological Effects of the Bromide of Ammonium ; — C. K. Aken, on the Transmutation of 

 Spectral Rays, Part I. : — Dr. Robinson, Report of the Committee on Fo',' Signals; — Report 

 of the Committee on Standards of Electrical Resistance ; — E. Smith, Abstract of Report by 

 the Indian Government on the Foods used by the Free and .lail Populations in Imlia ; — A. 

 Gages, Synthetical Researches on the Formation of Minerals, &c. ; — R. Mallett, Preliminary 

 Report on the Experimental I )etermination of the Temperatures of Volcanic Foci, and of the 

 Temperature, State of Saturation, and Velocity of the issuing Gases and Vapours ; — Report 

 of the Committee on Observations of Luminous Meteors; — Hfth Report of the Committee 

 on Steamship Performance ; G. J. Allman, Report on the Present State of our Knowledge 

 of the Reproductive S>stem in the Hydroida; — J. Glaisher, Account of Five Balloon Ascents 

 made in 186.3; — P. P. Carpenter, Supplementary Report on the Present State of our K'tow- 

 ledge with regard to the Molliisca of the West Coast of North America; — Professor Airy, 

 Report on Steam-boiler Explosions; — C. W. Siemens, Observations on the Electrical Resist- 

 ance and Electrification of some Insulating Materials under Pressures up to 300 Atmo- 

 spheres ; — C. M. Palmer, on the Construction of Iron Ships and the Progress of Iran Ship- 

 building on the Tyne, Wear, and Tees ; — Messrs. Richardson, Stevenson, and Clapham, on 

 the Chi-mical Manufactures of the Northern Districts; — Messrs. Sopwith and Richardson, 

 on the Local Manufacture of Lead, Copper, Ziuc, Antimony, &c. ; — Messrs. Daglish and 

 Forster, on the Magnesian Limestone of Durham ;— J. L. Bell, on the Manufacture of Iron 

 in connexion with the Northumberland and Durham Coal-field ;—T. Spencer, on the Manu- 

 facture of Steel in the Northern District;— H. J. S. Smith, Report on the Theory of Num- 

 bers, Part V. 



Together with the Transactions of the Sections, Sir William Armstrong's Address, and 

 Recommendations of the Association and its Committees. 



Printed by Taylor and Francis, Red Lion Court, Fleet Street. 



