I have thought that perhaps the best way to bring out properly Albert's knowledge in the physical sciences would be to take up Humboldt's headings in their order and illustrate them by quotations from the great scholar's writings--the only scholar to whom the epithet has been applied in all history--and from condensed accounts as they appear in his life written by Sighart. [Footnote 40] These will serve to show at once the extent of Albert's knowledge and the presumptuous ignorance of those who make little of the science of the medieval period. [Footnote 40: Sighart, Albertus Magnus: Sein Leben und Seine Wisenschaft, Ratisbon, 1857, or its translation by Dixon; Albert the Great, his life and scholastic labors. London, 1870.] When we have catalogued, for instance, the many facts with regard to astronomy and the physics of light that are supposed to be of much later entrance into the sphere of human knowledge that were grasped by {318} Albert, and evidently formed the subject of his teaching at various times at both Paris and Cologne, since they are found in his authentic works, we can scarcely help but be amused at the pretentious lack of knowledge that has relegated their author to a place in education so trivial as is that which is represented in many minds by the term scholastic. "He decides that the Milky Way is nothing but a vast assemblage of stars, but supposed, naturally enough, that they occupy the orbit which receives the light of the sun. The figures visible on the moon's disc are not, he says, as hitherto has been supposed, reflections of the seas and mountains of the earth, but configurations of her own surface. He notices, in order to correct it, the assertions of Aristotle that lunar rainbows appear only twice in fifty years; 'I myself,' he says, 'have observed two in a single year.' He has something to say on the refraction of a solar ray, notices certain crystals which have a power of refraction, and remarks that none of the ancients and few moderns were acquainted with the properties of mirrors."