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acid action animals appears body British called carried cause character chemical collected College communication complete connection considerable considered contains course December described determined direction effect electric engineering evidence examination existence experiments fact force give given heat illustrations important increase Institute interest knowledge known laboratory less light lines London matter means measured meeting method nature November object observations obtained occur original period photographs physical plants position possible practical present pressure probably produced Prof published question rays received recent recorded reference regard relation remarkable Royal scientific seems Society solution species stars suggested surface taken temperature theory tion tube units University various volume whole