Seeds of plants were sown in pure river-sand, in litharge, in flowers of sulphur, and even among metal, or common leaden shot; and in every instance nothing employed for their nourishment but distilled water. The plants throve, and passed through all the usual gradations of growth to perfect maturity. The author then proceeded to gather the entire produce, the roots, stems, leaves, pods, seeds, &c. These were accurately weighed, dried, and again weighed, then submitted to distillation, incineration, lixivation, and the other ordinary means used in a careful analysis. Thus he obtained from these vegetables all the materials peculiar to each individual species, precisely as if it had been cultivated in a natural soil--viz. the various earths, the alkalies, acids, metals, carbon, sulphur, phosphorus, nitrogen, &c. He concludes this very important paper nearly in these extraordinary words: “Oxygen and hydrogen, with the assistance of solar light, appear to be the only elementary substances employed in the constitution of the whole universe; and Nature, in her simple progress works the most infinitely diversified effects by the slightest modifications in the means she employs.”--See Recherches sur la Force assimilatrice dans les Végétaux, par M. Henri Braconnot, Annales de Chimie, Fev. et Mars, 1808. [100] He was born at Verona, of an illustrious family; and at the foot of Vesuvius, while attempting to ascertain the cause of an extraordinary cloud issuing therefrom, was, by the sulphureous exhalation from the burning lava, suffocated, A.D. 79.