Business is, of course, devoted to the increase of physical well-being; but what is Science? Now, in one sense, science is anything that true scientific men of the moment happen to be studying. In one decade, science means the discussion of spontaneous generation, or spontaneous variation, in the next of plasm, in the next of germs, or of electrodes. Whatever the scientific world takes up as a study becomes “science.” It is impossible to deny the truth of this rather self-destructive definition. In a more serious sense, however, science is the whole body of organized knowledge; and a distinction is sometimes made between “pure” science and “applied” science; the first being concerned solely with the ascertainment of truth, the second, with practical matters. In these higher regions, in which science is synonymous with the search for truth, science partakes of the nature of religion. It purifies its votaries; it speaks to them in cryptic language, revealing certain exalted realities not unrelated to the realities of music, or of poetry and religion. The men through whom this enthusiasm for pure science passes are surely, each in his degree, transmitters of heroic influence; and, in their own way, they form a kind of priesthood. It must be confessed, too, that this priesthood is peculiarly the product of the nineteenth century. The Brotherhood of Science is a new order, a new Dispensation. It would seem to me impossible to divide one’s feeling toward science according to the divisions “pure” and “applied”; because many men in whom the tide of true enthusiasm runs the strongest deal in applied science, as, for instance, surgeons, bacteriologists, etc. Nor ought we to forget those great men of science who have an attitude of sympathy toward all human excellence, and a reverence for things which cannot be approached through science. Such men resemble those saints who have also, incidentally, been kings and popes. Their personal magnitude obliterates our interest in their position in the hierarchy. We think of them as men, not as popes, kings or scientists. In the end we must admit that there are as many kinds of science as there are of men engaged in scientific pursuits. The word science legitimately means an immense variety of things, loosely connected together, some of them deserving of strong reprobation. I shall use the term with such accuracy as I am able to command, and leave it to the candid reader to make allowance for whatever injustice this course may entail.