We are now about to enter upon an examination of the greatest of all the operations of Nature—we are about to discourse to man upon his aliments,[1291] and to compel him to admit that he is ignorant by what means he exists. And let no one, misled by the apparent triviality of the names which we shall have to employ, regard this subject as one that is frivolous or contemptible: for we shall here have to set forth the state of peace or of war which exists between the various departments of Nature, the hatreds or friendships which are maintained by objects dumb and destitute of sense, and all, too, created—a wonderful subject for our contemplation!—for the sake of man alone. To these states, known to the Greeks by the respective appellations “sympathia” and “antipathia,” we are indebted for the first principles[1292] of all things; for hence it is that water has the property of extinguishing fire, that the sun absorbs water, that the moon produces it, and that each of those heavenly bodies is from time to time eclipsed by the other. Hence it is, too, descending from the contemplation of a loftier sphere, that the loadstone[1293] possesses the property of attracting iron, and another stone,[1294] again, that of repelling it; and that the diamond, that pride of luxury and opulence, though infrangible by every other object, and presenting a resistance that cannot be overcome, is broken asunder by a he-goat’s blood[1295]—in addition to numerous other marvels of which we shall have to speak on more appropriate occasions, equal to this or still more wonderful even. My only request is that pardon may be accorded me for beginning with objects of a more humble nature, though still so greatly conducive to our health—I mean the garden plants, of which I shall now proceed to speak. CHAP. 2. (1.)—THE WILD CUCUMBER; TWENTY-SIX REMEDIES. We have already stated[1296] that there is a wild cucumber, considerably smaller than the cultivated one. From this cucumber the medicament known as “elaterium” is prepared, being the juice extracted from the seed.[1297] To obtain this juice the fruit is cut before it is ripe—indeed, if this precaution is not taken at an early period, the seed is apt to spirt[1298] out and be productive of danger to the eyes. After it is gathered, the fruit is kept whole for a night, and on the following day an incision is made in it with a reed. The seed, too, is generally sprinkled with ashes, with the view of retaining in it as large a quantity of the juice as possible. When the juice is extracted, it is received in rain water, where it falls to the bottom; after which it is thickened in the sun, and then divided into lozenges, which are of singular utility to mankind for healing dimness[1299] of sight, diseases of the eyes, and ulcerations of the eyelids. It is said that if the roots of a vine are touched with this juice, the grapes of it will be sure never to be attacked by birds.