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ments for measuiing the Speed of Ships ; — Third Keport on the Datum-level of the 

 Ordnance Survey of Great Britain ; — Second Report on Patent Legislation ; — On 

 Self-acting Intermittent Siphons and the conditions which determine the com- 

 mencement of their Action; — On some further Evidence as to the Range of the 

 Palaeozoic Rocks beneath the South-east of England ; — Hydi-ography, Past and 

 Present. 



Together with the Transactions of the Sections, Prof. AUman's Address, and 

 Recommendations of the Association and its Committees. 



PROCEEDINGS of the FIFTIETH MEETING, at Swansea, August 

 and September 1880, Published at £1 4s. 



Contents : — Report on the Measurement of the Lunar Disturbance of Gravity; — 

 Thirteenth Report on Underground Temperature ; — Report of the Committee for 

 devising and constructing an improved form of High Insulation Key for Electrometer 

 Work ; — Report on Mathematical Tables ; — Report on the Calculation of Tables 

 of the Fundamental Invariants of Algebraic Forms; — Report on Observations of 

 Luminous Meteors ; — Report on the question of Improvements in Astronomical 

 Clocks ; — Report on the commencement of Secular Experiments on the Elasticity 

 of Wires ; — Sixteenth and concluding Report on Kent's Cavern ; — Report on the 

 mode of reproduction of certain species of Ichthyosaurus from the Lias of England 

 and Wiirtemburg ; — Report on the Carboniferous Polyzoa ; — Rejaort on the ' Geological 

 Record'; — Sixth Report on the Circulation of the Underground Waters in the 

 Permian, New Red Sandstone, and Jurassic Formations of England, and the Quantity 

 and Character of the Water supplied to towns and districts from these formations ; — 

 Second Report on the Tertiary (Miocene) Flora, &c., of the Basalt of the North of 

 Ireland ; — Eighth Report on the Erratic Blocks of England, Wales, and Ireland ; — 

 Report on an Investigation for the purpose of fixing a Standard of AVhite Light ; — 

 Report of the Anthropometric Committee ; — Report on the Influence of Bodily Exercise 

 on the Elimination of Nitrogen ; — Second Report on the Marine Zoologj^ of South 

 Devon ; — Report on the Occupation of a Table at the Zoological Station at Naples ; — 

 Report on accessions to our knowledge of the Chiroptera during the past two years 

 (1878-80); — Preliminary Report on the accurate measurement of the specific in- 

 ductive capacity of a good Sprengel Vacuum, and the specific resistance of gases at 

 different pressures ; — Comparison of Curves of the Declination Magnetographs at 

 Kew, Stonyhurst, Coimbra, Lisbon, Vienna, and St. Petersburg ; — First Report on 

 the Caves of the South of Ireland ; — Report on the Investigation of the Natural 

 History of Socotra ; — Rej^ort on the German and other systems of teaching the Deaf 

 to speak ; — Report of the Committee for considering whether it is important that 

 H.M. Inspectors of Elementary Schools should be appointed with reference to their 

 ability for examining in the scientific specific subjects of the Code in addition to 

 other matters ; — On the Anthracite Coal and Coalfield of South Wales ; — Report on 

 the present state of our knowledge of Crustacea (Part V.) ; — Report on the best means 

 for the Development of Light from Coal-gas of different qualities (Part 11.) ; — Report 

 on Palfflontological and Zoological Researches in Mexico ; — Report on the possibility 

 of establishing a ' Close Time ' for Indigenous Animals ; — Report on the present st'ate 

 of our knowledge of Spectrum Analysis ; — Report on Patent Legislation ; — Pre- 

 liminary Report on the present Appropriation of Wages, &c. ; — Report on the present 

 state of knowledge of the application of Quadratures and Interpolation to Actual 

 Data ; — The French Deep-sea Exploration in the Bay of Biscay ; — Third Report on 

 the Stationary Tides in the English Channel and in the North Sea, &;c. ; — List of 

 Works on the Geology, Mineral og}% and Palaeontology of Wales (to the end of 1873); — 

 On the recent Revival in Trade. 



Together with the Transactions of the Sections, Dr. A. C. Ramsay's Address, and 

 Recommendations of the Association and its Committees. 



PROCEEDINGS of the FIFTY-FIRST MEETING, at York, 

 August and September 1881, Published at £1 4s. 



Contents : — Report on the Calculation of Tables of the Fundamental Invariants 

 of Algebraic Forms; — Report on Recent Progress in Hydrodynamics (Part I.); — 

 Report on Meteoric Dust; — Second Report on the Calculation of Sun-heat Co- 



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