In physics Albertus Magnus was, if possible, more advanced { 47} and progressive even than in chemistry. His knowledge in the physical sciences was not merely speculative, but partook to a great degree of the nature of what we now call applied science. Humboldt, the distinguished German natural philosopher of the beginning of the Nineteenth Century, who was undoubtedly the most important leader in scientific thought in his time and whose own work was great enough to have an enduring influence in spite of the immense progress of the Nineteenth Century, has summed up Albert's work and given the headings under which his scientific research must be considered. He says:
"Albertus Magnus was equally active and influential in promoting the study of natural science and of the Aristotelian philosophy. His works contain some exceedingly acute remarks on the organic structure and physiology of plants. One of his works bearing the title of 'Liber Cosmographicus de Natura Locorum,' is a species of physical geography. I have found in it considerations on the dependence of temperature concurrently on latitude and elevation, and on the effect of different angles of incidence of the sun's rays in heating the ground, _which have excited my surprise_."
To take up some of Humboldt's headings in their order and illustrate them by quotations from Albert himself and from condensed accounts as they appear in his biographer Sighart and in Christian Schools and Scholars [Footnote 6], 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. When we have catalogued, for instance, the many facts with regard to astronomy and the physics of light that are supposed to have come to human ken much later, yet may be seen to have been clearly within the range of Albert's knowledge, and evidently formed the subject of his teaching at various times at both Paris and Cologne, for they are found in his authentic works, we can scarcely help but be amused at the pretentious misconception 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.