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We laugh at cold and bad weather, and are so strong and hearty that I shouldn't be surprised if I saw Webster and Everett flying round the Common on the new-fashioned velocipedes, for they believed in exercise. Goethe and Schiller often step over from De Vries's window, to flirt with the goddesses, who come down from their niches on Horticultural Hall.
At first, for many reasons, Weismann's theories did not meet with general acceptance, but during recent years there has been a marked return to many of his positions, mainly as the result of further cytological discoveries, and of the formulation of Mendel's Law and of De Vries's mutation theory.
But Mendel's Law has far greater definiteness, it explains more accurately the cases of alternative inheritance, and it may be shown to hold for blended and mosaic inheritance as well. De Vries's new "mutation theory" is clearly not an alternative but a complementary theory to natural selection, the Weismannian and Mendelian theories.
Some modern socialists have argued from de Vries's mutation theory in biology that in social evolution we must expect mutations also, and that, therefore, the great changes in human society are normally accomplished by means of revolution. But this argument rests wholly on analogy, and arguments from analogy in science are practically worthless.
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