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According adaptation adult ancestral animals appear appendages atrophy attended bear became become belonging body branches called cause ceased cells changes characters colony complete condition connected consists continue corporations course Court custom degeneration degenerative digits disappeared entirely established evolution examples exhibited existence facts female flowers formed frequently function further Illustrations importance individual instance institutions kind land lateral leaf leaves less limbs living longer lost male marriage means modification natural necessary normal occurs organs original pairs passed persist persons plants possess present primitive produced progressive protection recently reduced regarded remain represent result rudimentary says segment separate side similar social societies sometimes species stage stamens stem structure successive third tion traces transformation University useless various vertebrae vestiges whole young
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Página i - MILNE, Imperial College of Engineering, Tokio. With 38 Figures. $1.75. 56. MICROBES, FERMENTS, AND MOULDS. By EL TROUESSART. With 107 Illustrations. $1.50. 57. THE GEOGRAPHICAL AND GEOLOGICAL DISTRIBUTION OF ANIMALS. By Professor ANGELO HEILPRIN, Academy of Natural Sciences, Philadelphia.