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A. J. Cooke action American animal Aphides Association become bees Beneficence blood blossoms body called carbon cause cell theory centimetre chemical clover color conductor constitution crests destructive metabolism division of labor effects electric elements ence evolution philosophy experiments eyes fact faith-curer film flash force frog furnish G. P. Putnam's Sons honey hypnotic individual insects instruction interest kind knowledge language less Lick Observatory light living Luys Mantegazza material matter ment motion natural natural selection nutrition observed organic ovum PAOLO MANTEGAZZA particles pass phenomena physiological plants present processes produced Prof properties proteids protoplasm Protozoa reproductive cells schools scientific somatic cells species Spencer square centimetre student substance supposed surface separating air teaching tension theory tion tissues tube various waves Weismann white clover wind wood frog York