All united in honoring the marvellous genius whose work has proved of such practical utility for mankind, and whose discoveries are as yet only beginning their career of pregnant suggestiveness to scientific men. His genius has brought the great ones of earth to his level or raised him to theirs. His own thought on the equality of man is a confession of the faith that was in him. It was expressed in his discourse of reception into the French Academy in the midst of the panegyric on Littré, from which we quoted at the beginning of this sketch: "Where are the true sources of human dignity, of liberty and of modern democracy, if not in the infinite, before which all men are equal? The notion of the infinite finds everywhere its inevitable expression. By it the supernatural is at the bottom of every heart." Pasteur, the man, is, however, if possible, even more interesting than Pasteur, the greatest of living scientists. In the midst of all his work and his wonderful success, amid the plaudits of the world, Pasteur remained one of the simplest of men and the kindest of friends to those who knew him. Dr. Roux's expression is well known: "The work of Pasteur is admirable; it shows his genius; but one must have lived on terms of intimacy with him in order to know all the goodness of his heart." He was kindness personified, and those who think of him as a cruel vivisector and encourager of experiments upon animals that cause suffering, belie him and his humanity very much. He would never permit animals to be used in experiments without an anesthetic, and even then only when he deemed that use absolutely necessary for the furtherance of projects that promised great benefit to humanity. Nothing was harder for him to do than to walk the hospitals and see human suffering when he was studying the causes of disease in human beings. Even the slight pain inflicted during the {317} injections for hydrophobia was a source of great discomfort to him, and his anxiety with regard to these patients was one of the main causes of the breakdown in health that shortened his life. One of the most beautiful things about Pasteur's personal life is the relation to his family, and especially to his children, and their union in religious simplicity. On the occasion of the death of his father, whom Pasteur loved very deeply and for whom he had instilled the deepest affection into the hearts of his children, he wrote to his daughter, whose first communion was to occur on that day. His letter is that of a man deeply affectionate, sincerely religious, and eminently trustful of the future that faith alone points out. His letter runs: