Thus, among the papers and reviews of that time we can follow the divers ideas brought out by these discussions. Guizot, then almost eighty, touched on this problem with the slightly haughty assurance of one conscious of having given much thought to his beliefs and destiny. “Man has not been formed through spontaneous generation, that is by a creative and organizing force inherent in matter; scientific observation daily overturns that theory, by which, moreover, it is impossible to explain the first appearance upon the earth of man in his complete state.” And he praised “M. Pasteur, who has brought into this question the light of his scrupulous criticism.” Nisard was a wondering witness of what took place in the small laboratory of the Ecole Normale. Ever preoccupied by the relations between science and religion, he heard with some surprise Pasteur saying modestly, “Researches on primary causes are not in the domain of Science, which only recognizes facts and phenomena which it can demonstrate.” Pasteur did not disinterest himself from the great problems which he called the eternal subjects of men’s solitary meditations. But he did not admit the interference of religion with science any more than that of science with religion. His eagerness during a conflict was only equalled by his absolute forgetfulness after the conflict was over. He answered some one who, years later, reminded him of that past so full of attacks and praises. “A man of science should think of what will be said of him in the following century, not of the insults or the compliments of one day.” Pasteur, anxious to regain lost time, hurried to return to his studies on wine. “Might not the diseases of wines,” he said at the Académie des Sciences in January, 1864, “be caused by organized ferments, microscopic vegetations, of which the germs would develop when certain circumstances of temperature, of atmospheric variations, of exposure to air, would favour their evolution or their introduction into wines?... I have indeed reached this result that the alterations of wines are co-existent with the presence and multiplication of microscopic vegetations.” Acid wines, bitter wines, “ropy” wines, sour wines, he had studied them all with a microscope, his surest guide in recognizing the existence and form of the evil.