and the union of the parts of vegetables is so thoroughly dissolved, that putrefaction commences. God has endued the vegetable creation with the astonishing power of multiplying itself by seeds, slips, roots. &c. ad infinitum: it contains in itself all the rudiments of the future plants through their endless generations. The celebrated Linnæus, in an “oration concerning the augmentation of the habitable earth,” which proceeds on the supposition of the existence of a sexual system in the vegetable world, shows how from one plant of each species the immense number of individuals now existing might arise. He gives some instances of the surprising fertility of certain plants; as, of the elecampane, one plant of which produced 3,000 seeds; of spelt, 2,000; of the sun-flower, 4,000; of the poppy, 3,200; of tobacco, 40,320: and one grain of Turkey-corn produces 2,000 others! But supposing any annual plant producing yearly only two seeds, even of these, after 20 years, there would be 1,048,576 individuals. For they would increase yearly in a double proportion, _viz._ 2, 4, 8, 16, 32, &c. The seed of the _elm_, as a learned author observes, affords a remarkable instance of the prolific power with which the vegetable creation is endued, to multiply its different species. “This tree produces one thousand five hundred and eighty-four millions of seeds; and each of these seeds has the power of producing the same number. How astonishing is this produce! At first one seed is deposited in the earth; from this one a tree springs, which in the course of its vegetative life produces one thousand five hundred and eighty-four millions of seeds. This is the first generation. The second generation will amount to two trillions, five hundred and ten thousand and fifty-six billions. The third generation will amount to fourteen thousand six hundred and fifty-eight quadrillions, seven hundred and twenty-seven thousand and forty trillions! And the fourth generation from these would amount to fifty one sextillions, four hundred and eighty-one thousand three hundred and eighty-one quintillions, one hundred and twenty-three thousand one hundred and thirty-six quadrillions! Sums too immense for the human mind to conceive; and when we allow the most confined space in which a tree can grow, it appears that the seeds of the third generation from one elm would be many myriads of times more than sufficient to stock the whole superficies of all the planets in the solar system!”