results, how is it possible to call mind the same as it was a generation or two ago, when the sciences were fewer, their industry more leisurely, and their discoveries less frequent? Nay, but we may go back not a generation or two only, but to generation beyond generation through a long series, still, as we ascend, finding the sciences fewer, earth's load of knowledge lighter, and man's very imagination of the physical universe which he tenants cruder and more diminutive. Till two hundred years ago the Mundus, or physical system of things, to even the most learned of men, with scarcely an exception, was a finite spectacular sphere, or succession of spheres, that of the fixed stars nearly outermost, wheeling round the central earth for her pleasure; as we penetrate through still prior centuries, even this finite spherical Mundus is seen to shrink and shrink in men's fancies of it till a radius of some hundreds of miles would sweep from the earth to the starry roof; back beyond that again the very notion of sphericity disappears, and men were walking, as it seemed, on the upper side of a flat disc, close under a concave of blue, travelled by fiery caprices. How is it possible to regard man's mode of thinking and feeling, man's mind, as in any way constant through such vicissitude in man's notions respecting his very housing in space, and the whole encircling touch of his physical belongings? (3.) A third consideration, however, administers a kind of corrective to the last. It is that, though the last consideration is not unimportant, its importance practically, and as far as the range of historic time is concerned, may be easily exaggerated. We have supposed a person betaking himself to the study of geology, and have truly said that his very mode of thinking would be thereby affected, that his geological knowledge would pass into his reason, and determine so far the very cast of his mind, the form of his ability. Well, but he might have betaken himself to something else; and who can tell, without definite investigation, but that out of that something else he might have derived as much increase of his mental power, or even greater? There are thousands of employments for all minds, and, though all may select, and select differently, there are thousands for all in common. Life itself, all the inevitable activity of life, is one vast and most complex schooling. Books or no books, sciences or no sciences, we live, we look, we love, we laugh, we fear, we hate, we wonder; we are sons, we are brothers, we have friends; the seasons return, the sun shines, the moon walks in beauty, the sea roars and beats the land, the winds blow, the leaves fall; we are young, we grow old; we commit others to their graves, we see somewhere the little grassy mound which shall conceal ourselves:--is not this a large enough primary school for all and sundry; are not these sufficient and everlasting rudiments? That so it is we all recognise.