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acid aldehydes American animal antler ascer astronomers Bacteria bivalves body Bryozoa called charlock chemistry curves diagonal biped earth effect ence essence Europe existence experiments fact Fahr feet flask fluid Flustra gallop germs give ground heat horse human hydrophobia impacts influence instance instrument investigation killed kind known living matter mathematics Max Schultze ment method metric system miles mollusk motion natural naturalists nebular hypothesis neroli never Newcomb notation object observations odors olfactory olfactory nerves organisms original oyster pace parallax perfumes periosteum physical physiology planet position present principles Prof progress protoplasm proved reader relation remarkable scent scientific seen sensation sense of smell shell Smith solar solar system spectroscope stars substances sun's distance temperature theory thing tion transit transit of Venus trot velocity of light Venus