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of the experiments, contained in this collection, to be vulgar and trivial, mean and sordid, curious and fruitless : and therefore, he wisheth that they would have perpetually before their eyes what is now in doing, and the difference between this Natural History and others. For those Natural Histories which are extant, being gathered for delight and use, are full of pleasant descriptions and pictures, and affect and seek after admiration, rarities, and secrets. But, contrariwise, the scope which his lordship intendeth, is to write such a Natural History, as may be fundamental to the erecting and building of a true philosophy, for the illumination of the undera standing, the extracting of axioms, and the producing of many noble works and effects. For he hopeth by this means to acquit himself of that for which he taketh himself in a sort bound, and that is, the advancement of all learning and sciences. For, having in this present work collected the materials for the building, and in his Novum Organum, of which his lordship is yet to publish a second part, set down the instruments and directions for the work; men shall now be wanting to themselves, if they raise not knowledge to that perfection whereof the nature of mortal men is capable. And in this behalf, I have heard his lordship speak complainingly, that his lordship, who thinketh he deserveth to be an architect in this building, should be forced to be a workman, and a labourer, and to dig the clay, and burn the brick ; and, more than that, according to the hard condition of the Israelites at the latter end, to gather the straw and stubble, over all the fields, to burn the bricks withal. For he knoweth, that except he do it, nothing will be done: men are so set. to despise the means of their own
godd. And as for the baseness of many of the er-
other men would now think that they could do the like ; and so go on with a further collection : which, if the method had been eract, many would have despaired to attain by imitation. As for his lordship’s love of order, I can refer any man to his lordship's Latin book, De Augmentis Scientiarum ; which, if my judgment be any thing, is written in the exactest order that I know any writing to be. I will conclude with an usual speech of his lordship’s: That this work of his Natural History is the World as God made it, and not as men have made it ; for that it hath nothing of imagination.
This epistle is the same, that should have been prefixed to this book, if his lordship had lived.
Experiments in consort, touching the straining and
passing of bodies one through another ; which
they call Percolation. Dis a pit upon the sea-shore, somewhat above the high-water mark, and sink it as deep as the lowwater mark; and as the tide cometh in, it will fill with water, fresh and potable. This is commonly practised upon the coast of Barbary, where other fresh water is wanting. And Cæsar knew this well when he was besieged in Alexandria : for by digging of pits in the sea-shore, he did frustrate the laborious works of the enemies, which had turned the seawater upon the wells of Alexandria; and so saved his army being then in desperation. But Cæsar mis. took the cause, for he thought that all sea-sands had natural springs of fresh water: but it is plain, that it is the sea-water; because the pit filleth according to the measure of the tide; and the sea-water passing or straining through the sands, leaveth the saltness.
2. I REMEMBER to have read, that trial hath been made of salt-water passed through earth, through ten vessels, one within another; and yet it hath not lost its saltness, as to become potable: but the same man saith, that, by the relation of another, salt-water drained through twenty vessels hath become fresh. This experiment seemeth to cross that other of pits made by the sea-side; and yet but in part, if it be true that twenty repetitions do the effect. . But it is worth the note, how poor the imitations of nature are in common course of experiments, except they be led by great judgment, and some good light of axa ioms. For first, there is no small difference between VOL. I.
a passage of water through twenty small vessels, and through such a distance, as between the low-water and high-water mark. Secondly, there is a great difference between earth and sand; for all earth hath in it a kind of nitrous salt, from which sand is more free; and besides, earth doth not strain the water so finely as sand doth. But there is a third point, that I suspect as much or more than the other two; and that is, that in the experiment of transmission of the sea-water into the pits, the water riseth ; but in the experiment of transmission of the water through the vessels, it falleth. Now certain it is that the salter part of water, once salted throughout, goeth to the bottom. And therefore no marvel, if the draining of water by descent doth not make it fresh: besides, I do somewhat doubt, that the very dashing of the water, that cometh from the sea, is more proper to strike off the salt part, than where the water slideth of its own motion.
3. It seemeth percolation, or transmission, which is commonly called straining, is a good kind of sepatation, not only of thick from thin, and gross from fine, but of more subtile natures; and varieth according to the body through which the transmission is made: as if through a woolten bag, the liquor leaveth the fatness; if through sand, the saltness, etc. They speak of severing wine from water, passing it through ivy wood, or through other the like porous body; but non constat. r 4. THE gum of trees, which we see to be commonly shining and clear, is but a fine passage or straining of the juice of the tree through the wood and bark. And in like manner, Cornish diamonds, and rock rubies, which are yet more resplendent than giuns, are the fine exudations of stone.
5. ARISTOTLE giveth the cause, vainly, why the feathers of birds are of more lively colours than the bairs of beasts; for no beast hath any fine azure, or carnation, or green hair. He saith, it is because birds are more in the beams of the sun than beasts; but that is manifestly untrue; for cattle are more in the sun than birds, that live commonly in the woods, or in