Nature, Volume 39

action amount appears arrangement become birds body called character collection College comet complete connection considerable considered contains course crystals described determined direction effect electric examination existence experiments fact feet force give given heat important increase indicate interesting Islands Italy kind known less light lines London mass matter means measure meeting method natural November observations obtained occur organic origin passed period plants position possible present probably produced Prof published question reached received recent reference regard region relation remains remarkable Report rocks Royal scientific seems seen separate side similar Society species stars structure substance surface tables taken temperature theory tion United University various volume whole