BRITISH ASSOCIATION FOR THE ADVANCEMENT 
OF SCIENCE. 
Life Members (since 1845), and all Annual Members who have not 
intermitted their Subscription, receive gratis all Reports published after 
the date of their Membership. Any other volume they require may be 
obtained on application at the Office of the Association, Burlington 
House, Piccadilly, London, W., at the following prices, viz—Reports for 
1831 to 1874 (of which more than 15 copies remain), at 2s. 6d. per volume ; 
after that date, at two-thirds of the Publication Price. A few sets, from 
1831 to 1874 inclusive, may also be obtained at £10 per set. 
Associates for the Meeting in 1905 may obtain the Volume for the Year at two-thirds 
; of the Publication Price. 
REPORT or tar SEVENTY-FOURTH MEETING, at Cam- 
bridge, August 1904, Published at £1 4s. 
CONTENTS. 
Rules of the Association, Lists of Officers, Report of the Council, List of Com- 
mittees, Grants of Money, &c. . Xxxi-cxxViii 
Address by the President, the Right Hon. A. J. Ba ifour, D: CL. i M. Pi EARS. 3 
Third Report on the Investigation of the Upper Atmosphere by means of 
Kites. Apes 
Report on the Theory of Point- -groups. Part IV, By Frances Hardcastle 
PAGE 
Report on Magnetic Observations at Falmouth Observatory . » 29 
Report on Electrical Standards . : P ° ° , . . . 380 
Ninth Report on Seismological Investigations : . 5 - : : Spe 
Twenty-third Report on Underground Temperature , . : : ’ » 51 
Report on Meteorological Observations on Ben Nevis ° : . . » 55 
Report on the Study of Hydro-aromatic Substances . 60 
Report on Wave-length Tables of the Spectra of the Elements and Compounds 66 
The Stereochemistry of Nitrogen. By Dr.H.O.Jones . . » » ~~ 169 
Dynamic Isomerism, By Dr. T. M. Lowry 193 
Fifth Report on the Movements of Godeesranit’ Waters of North- West York- 
shire. . é ‘ . = . 226 
Report on Life-zones in the British Carboniferous Rocks . . . ’ » 226 
‘Ninth Report on the Erratic Blocks of the British Isles. 237 
Fifteenth Report on Photographs of Geological Interest in the United Kingdom 242 
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