Physiology, Astronomy, Geology, Botany, and kindred sciences, are not now, as formerly, confined to our higher seminaries of learning. They are being introduced into the common schools, not only of our large towns and cities, but of our little villages throughout New-England. Hence a knowledge of these sciences is becoming general. It needs not Sibylline wisdom to predict that the time is not far distant when it will be more disadvantageous and more humiliating to be ignorant of their principles and technicalities, than to be unable to tell the length and breadth of Sahara, the rise, course and fall of little rivers in other countries, which we shall never see, never hear mentioned--and the latitude and longitude of remote or obscure cities and towns. If a friend would describe a flower, she would not tell us that it has so many flower-leaves, so many of those shortest things that rise from the centre of the flower, and so many of the longest ones; but she will express herself with more elegance and rapidity by using the technical names of these parts--petals, stamens, and pistils. She will not tell us that the green leaves are formed some like a rose-leaf, only that they are rounder, or more pointed, as the case may be; or if she can find no similitudes, she will not use fifty words in conveying an idea that might be given in one little word. We would be able to understand her philosophical description. And scientific lectures, the sermons of our best preachers, and the conversation of the intelligent, presuppose some degree of knowledge of the most important sciences; and to those who have not this knowledge, half their zest is lost. If we are so situated that we cannot attend school, we have, by far the greater part of us, hours for reading, and means to purchase books. We should be systematic in our expenditures. They should be regulated by the nature of the circumstances in which we find ourselves placed,--by our wages, state of health, and the situation of our families. After a careful consideration of these, and other incidentals that may be, we can make a periodical appropriation of any sum we please, for the purchase of books. Our readings, likewise, should be systematic. If we take physiology, physiology should be read exclusively of all others, except our Bibles and a few well-chosen periodicals, until we acquire a knowledge of its most essential parts. Then let this be superseded by others, interrupted in their course only by occasional reviews of those already studied.