698 
PROCEEDINGS or raz FIFTIETH MEETING, at Swansea, August 
and September 1880, Published at £1 4s. 
CONTENTS :—lieport 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 ;—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 ;—Highth 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 
(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 ;—Report 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 défferent qualities (Part II.) ;—Report 
on Paleontological and Zoological Researches in Mexico ;—Report on the possibility 
of establishing a ‘ Close Time’ for Indigenous Animals ;—Report on the present state 
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, Mineralogy, and Palzontology 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 or tae FIFTY-FIRST MEETING, at York, 
August and September 1881, Published at £1 As. 
CoNTEN'TS :—Report on the Calculation of Tables of the Fundamental Invariants 
of Algebraic Forms;—Report on Recent Progress in Hydrodynamics (Part I.) ;— 
Report on Meteorie Dust;—Second Report on the Calculation of Sun-heat Co- 
efficients ;—Fourteenth Report on Underground Temperature ;—Report on the 
Measurement of the Lunar Disturbance of Gravity;—Second Report on an In- 
vestigation for the purpose of fixing a Standard of White Light ;—Final Report on 
the Thermal Conduetivities of certain Rocks;—Report on the manner in which 
Rudimentary Science should be taught, and how Examinations should be held 
therein, in Elementary Schools ;—Third Report on the Tertiary Flora of the North 
_ of Ireland ;—-Report on the Method of Determining the Specific Refraction of Solids 
