34. How artificial sea-water may be made in places at a distance from the sea 498 35. How thalassomeli is made _ib._ 36. How hydromeli is made _ib._ 37. Methods of providing against the inconvenience of drinking suspected water 499 38. Six remedies derived from moss. Remedies derived from sand _ib._ 39. The various kinds of salt; the methods of preparing it, and the remedies derived from it. Two hundred and four observations thereupon 500 40. Muria 503 41. The various properties of salt: one hundred and twenty historical remarks relative thereto 504 42. Flower of salt: twenty remedies. Salsugo: two remedies 506 43. Garum: fifteen remedies 507 44. Alex: eight remedies 508 45. The nature of salt 509 46. The various kinds of nitrum, the methods of preparing it, and the remedies derived from it: two hundred and twenty-one observations thereon 512 47. Sponges, and the remedies derived from them: ninety-two observations thereon 519 NATURAL HISTORY OF PLINY BOOK XXIV. THE REMEDIES DERIVED FROM THE FOREST TREES. CHAP. 1. (1.)—THE ANTIPATHIES AND SYMPATHIES WHICH EXIST AMONG TREES AND PLANTS. Not even are the forests and the spots in which the aspect of Nature is most rugged, destitute of their peculiar remedies; for so universally has that divine parent of all things distributed her succours for the benefit of man, as to implant for him medicinal virtues in the trees of the desert even, while at every step she presents us with most wonderful illustrations of those antipathies and sympathies which exist in the vegetable world.