The Popular Science Monthly, Volume 44

according American animals appear become better birds body called carried cause cent century common course direction early earth effect evidence evolution existence experiments fact feet force fruit give given greater hand heat human hundred idea illustrated important increase interest Italy kind known land less light living matter means method miles mind moral natural never North object observations organism origin passed period persons plants position possession possible practical present Prof published question race reason recent regard relation result schools scientific seems side society South species success surface theory things thought thousand tion United University various volume whole writing York