How much was accomplished in applied science during the Middle Ages, that is, in those departments of science which are usually supposed to have been least cultivated, since educators are prone to ridicule the over-emphasis of speculation in education and the constant preoccupation of mind of the scholars of these generations with merely theoretic questions, may be appreciated from any history of the arts and architecture during the thirteenth, fourteenth, and fifteenth centuries. Some of the most difficult problems in mechanics as applied to the structural work of cathedrals, palaces, castles, fortresses, and bridges, were solved with a success that was only equaled by the audacity with which they were attempted. Men hesitated at nothing. There is no problem of mechanical engineering as applied to structural work which these men did not find an answer for in their wonderful buildings. This has been very well brought out by Prince Kropotkin in certain chapters of his book, Mutual Aid a Factor of Evolution, in which he treats of mutual aid in the medieval cities. He says:
“At the beginning of the eleventh century the towns of Europe were small clusters of miserable huts, adorned with but low clumsy churches, the builders of which hardly knew how to make an arch; the arts, mostly consisting of some weaving and forging, were in their infancy; learning was found in but a few monasteries. Three hundred and fifty years later, the very face of Europe had been changed. The land was dotted with rich cities, surrounded by immense thick walls which were embellished by towers and gates, each of them a work of art itself. The cathedrals, conceived in a grand style and profusely decorated, lifted their bell-towers to the skies, displaying a purity of form and a boldness of imagination which we now vainly strive to attain. The crafts and arts had risen to a degree of perfection which we can hardly boast of having superseded in many directions, if the inventive skill of the worker and the superior finish of his work be appreciated higher than rapidity of fabrication. The navies of the free cities furrowed in all directions the Northern Seas and the Southern Mediterranean; one effort more and they would cross the oceans. Over large tracts of land, well-being had taken the place of misery; learning had grown and spread; the methods of science had been elaborated; the basis of natural philosophy had been laid down; and the way had been paved for all the mechanical inventions of which our own times are so proud.”
The period for which Prince Kropotkin is thus enthusiastic in the matter of applied science, is all before the date usually given as the beginning of the Renaissance–the fall of Constantinople in 1453. The three centuries and a half from the beginning of the eleventh century represent just the time of the rise of scholasticism and the beginning of its decline. Few periods of history are so maligned as regards their intellectual feebleness, and in nothing is that quality supposed to be more marked than in applied science; yet here is what a special student of the time says of this very period in this particular department.
James J. Walsh, The Popes and Science (1908)