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actinium Agassiz Alpheus Spring Packard animals apparent mass appears atoms of radium Bowdoin break building Cardinal Bellarmine changes character charge carried charged particles chemical Chukchee College Copernican doctrine Copernicus Darwin Darwinian deduced definite variations deflected direct electric field electrons emana Eome evidence evolution experimental February 26 fluctuating variations ft particles ft rays Galileo give gram calories gram of radium half transformed Harvard Medical School heat emission heating effect helium helium atom hydrogen individual ionization J. J. Thomson laboratory lecture medicine method mutations natural selection negative charge observed obtained organism origin origin of species Packard particles expelled penetrating pitchblende plants polonium Pope positive charge present probable Professor question radiation radio-elements radioactive bodies radioactive equilibrium radioactive matter radioactive products radioactive substances radium bromide radium emanation result shown Simplicius suppose thorium thorium and actinium tion tobacco uranium value of e/m velocity Weismann