The Book of Nature

able action already animals appears become belong birds blood body brain called cause character chiefly common consequence considerable consists constitutes continued denominated derived direct distinct distinguished doctrine earth effect equally example existence extensive external fact faculty feeling fishes former four give given hand head heart hence human ideas immediately important insects instances instinct intelligence Italy kind knowledge known language laws lecture less light living manner material matter means meet mind nature never objects observed occasion occasionally operation organs origin passions perfect perhaps period persons philosophers plants possess present principle produced proof prove reason regarded respect result says seems sensation sense separate similar sometimes species substance sufficient supposed term thing tion traced tribes variety various vegetable whole