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aeroplane American anatomy animalcules animals appear Arequipa asteroids astronomers balloon blood Bode's law Bureau cent century children of ability commerce conclusions cotton course degree distance earth eldest eminent ability eminent persons Eros Europe excess exports fact father favorable February 21 foreign genius genius-producing families Germany grammar school Harvard Observatory heliometer high school humidity important increase industrial insects interesting investigation known large number Latin Leeuwenhoek less machine malaria Malpighi manufactures markets Mars mean mental meteorological methods microscope million miles mother natural ne'er-do-weel object observations Observatory parents perihelion photographs planet plates position pre-high-school present problems production pupil saturation point says scientific scientific method seems shown silkworm sketches soil solar parallax South America stars structure of plants student suicide Swammerdam tion trade transit of Venus United University University of Bologna weather youngest