715 



Sandstone, and Fermiau Formations, with an Appendix on the Filtration of Water 

 through Triassic Sandstone ; — Keport on the Effect of Propellers on the Steering of 

 Vessels. 



Together with the Transactions of the Sections, Mr. Spottiswoode's Address, and 

 Recommendations of the Association and its Committees. 



PROCEEDINGS of the FORTY-NINTH MEETING, at Sheffield, 

 Aitgust 1879, Fuhlished at £1 4s. 



Contents : — Report on the commencement of Secular Experiments upon the 

 Elasticity of Wires ; — Fourtli Report of the Committee for determining the Mechan- 

 ical Equivalent of Heat ; — Report of the Committee for endeavouring to procure 

 reports on the Progress of the Chief Branches of Mathematics and Physics; — Twelfth 

 Report on Underground Temperature ; — Report on Blathematical Tables ; — Sixth 

 Report on the Thermal Conductivities of certain Rocks ; — Report on Observations 

 of Atmospheric Electricity at Madeira : — Report on the Calculation of Tables of the 

 Fundamental Invariants of Algebraic Forms ; — Report on the Calculation of Sun- 

 Heat Coefficients ; — Second Report on the Stationary Tides in the English Channel 

 and in the North Sea, &c. ; — Report on Observations of Luminoas Meteors ; — Report 

 on the question of Improvements in Astronomical Clocks ; — Report of the Committee 

 for improving gji Instrument for detecting the jsresence of Fire-damp in Mines ; — 

 Report on the Chemistry of some of the lesser-known Alkaloids, especially Veratria 

 and Beeberine ; — Seventh Report on the Erratic Blocks of England, Wales, and Ire- 

 land ; — Fifteenth Report on Kent's Cavern ; — Report on certain Caves in Borneo ; — 

 Fifth Report on the Circulation of Underground Waters In the Jurassic, Red Sand- 

 stone, and Permian Formations of England ; — Report on the Tertiary (Miocene) 

 Flora, &:c., of the Basalt of the North of Ireland ; — Report on the possibility of 

 Establishing a ' Close Time ' for the Protection of Indigenous Animals ; — Report on 

 the Marine Zoology of Devon and Cornwall ; — Report on the Occupation of a Table 

 at the Zoological Station at Naples; — Report on Excavations at Portstewart and 

 elsewhere in the North of Ireland ; — Report of the Anthropometric Committee ; — 

 Report on the Investigation of the Natural History of Socotra ; — Report on Instru- 

 ments for measuring the Speed of Ships ; — Third Report 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 ; — Hydrography, Past and 

 Present. 



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

 Recommendations of the Association and its Committees. 



PROCEEDINGS op the FIFTIETH MEETING, at Swansea, August 

 and September 1880, Published at £\ 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; — Reports 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 ;— Report 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 White Light ; — 

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

 on the Elimination of Nitrogen ;— Second Report on the Marine Zoology 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 



