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|On the Tendency of Species to Form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection |5 |- |The Story of the Cahow |22 |- |Psychiatry - Ancient, Medieval and Modern |31 |- |The National Control of Education |49 |- |The Evolution of the Human Intellect |58 |- |The Origin of Sex in Plants |66 |- |The Fishes of Japan |76 |- |The Omen Animals of Sarawak |80 |- |Scientific Literature |89 |- |The Progress of Science |92 |- |colspan=2| |- |A Mechanical Solution of a Literary Problem |97 |- |The Importance of General Statistical Ideas |106 |- |The Aims of the National Physical Laboratory of Great Britain |124 |- |Cement for a Modern Street |145 |- |The Influence of Rainfall on Commerce and Politics |158 |- |Lucretius and the Evolution Idea |166 |- |Sensory Mechanism of Plants |174 |- |On the Reception of the Origin of Species |177 |- |Scientific Literature |185 |- |The Progress of Science |187 |- |colspan=2| |- |The Minnesota Seaside Station |193 |- |Antarctic Exploration |209 |- |The Possible Improvement of the Human Breed Under the Existing Conditions of Law and Sentiment |218 |- |The End of the Filth Theory of Disease |234 |- |Recent Total Eclipses of the Sun |240 |- |Friar Roger Bacon |255 |- |Lamarck, The Founder of Evolution |263 |- |Comets' Tails, The Corona and the Aurora Borealis |265 |- |Discussion and Correspondence |279 |- |Scientific Literature |281 |- |The Progress of Science |283 |- |colspan=2| |- |Stellar Evolution in the Light of Recent Research |291 |- |Winged Reptiles |314 |- |The Journeyings of Birds |323 |- |Environment in Relation to Sex in Human Culture |336 |- |The College-Man as Leader in the World's Work |346 |- |Theology versus Thrift in the Black Belt |360 |- |The Descent of Man |365 |- |Discussion and Correspondence |377 |- |Scientific Literature |376 |- |The Progress of Science |379 |- |colspan=2| |- |The Palm Trees of Brazil |387 |- |Work and Rest: Genius and Stupidity |413 |- |Science in 1901 |424 |- |Franklin's Philosophical Society |430 |- |Alpheus Hyatt |439 |- |Suicidal Fanaticism in Russia |442 |- |The Differentiation of the Human Species |448 |- |Were the Earliest Organic Movements Conscious or Unconscious? |458 |- |Trust Deed by Andrew Carnegie, Creating a Trust for the Benefit of the Carnegie Institution, of Washington, D. C. |470 |- |Scientific Literature |473 |- |The Progress of Science |475 |- |colspan=2| |- |Is This a Degenerate Age? |481 |- |The Formation and Motions of Clouds |495 |- |Contributions to Biology from Investigations on the Breeding Salmon |503 |- |What Is Philosophy? |513 |- |A Study of Calms |521 |- |Our Foreign Commerce in 1901 |529 |- |The Soil as an Economic and Social Factor |539 |- |The Draining of the Zuider Sea |551 |- |The Evolution of Fishes |556 |- |Scientific Literature |565 |- |The Progress of Science |568 |- |Index |573 |- |}Popular Science Monthly Volume 60