The Popular Science Monthly, 24. köide

action agnosticism animal appearance become birds body brain called carbonic acid casein catarrh cause cent cheese classical cold color compsognathus conduct course cubic metres direction disease dyspepsia earth effect electric energy evil exercise existence experience fact faculty favor feet fever force G. P. Putnam's Sons German give Greek growth heat Herbert Spencer human hundred iguanodon increase influence Ischia kind knowledge Lake of Bienne Lamarck larvæ leprosy less light living loess malaria matter means ment mental method mind modern muscular nature nitrogen object observed organic oxygen period persons phenomena physical practical present principle produced Professor question race regard schools scientific surface temperature testator theory things thought tion trees whole wires