[54] Since writing the above, I have referred for information on this subject, and find, that the Anguillula aceti exhibits sexual distinctions; and that the ovaries of the females are situated on each side of the alimentary canal.--_Cyclo. Anat. and Phys. Art. Entozoa._ [55] Speaking of the examination of the infusory animalcules--Mr. Kirby says: "But to us the wondrous spectacle is seen, and known only in part; for those that still escape all our methods of assisting sight, and remain members of the invisible world, may probably _far exceed those that we know_."--_Bridgewater Treatise_, vol. i. p. 158. [56] Mr. Owen has added another class, as the first, called Protelmintha, which comprises the cercariadae and vibrionidae. [57] "It is probable that in the waters of our globe an infinity of animal and vegetable molecules are suspended, that are too minute to form the food of even the lowest and minute animals of the visible creation: and therefore an infinite host of invisibles was necessary to remove them as nuisances."--_Bridgewater Treatise_, vol. i. p. 159. "When Creative Wisdom covered the earth with plants, and peopled it with animals, He laid the foundations of the vegetable and animal kingdoms with such as were most easily convertible into nutriment for the tribes immediately above them. The first plants, and the first animals, are scarcely more than animated molecules,* and appear analogues of each other; and those above them in each kingdom represent jointed fibrils."+--_Bridgewater Treatise_, vol. i. p. 162. * Globulina and Monus. + Oscillatoria and Vibrio. [58] "A treatise which should present a systematic arrangement of all the diseases of plants, giving in detail the exact history of each, and adding the means of preventing and curing them, would certainly be of the greatest utility to agriculture." --_Essay on the Diseases of Plants, Count Philippo R['e], translated into Gardener's Chron._ [59] "Plenck published a treatise on Vegetable Pathology, in which he divided diseases into eight classes: 1. External injuries; 2. Flux of juices; 3. Debility; 4. Cachexies; 5. Putrefactions; 6. Excrescences; 7. Monstrosities; and 8. Sterility. And he concludes with an enumeration of the animals which injure plants."--_Essay on the Diseases of Plants, Gardener's Chronicle._ [60] The Bunt. "This disease appears at the moment of the germination of the plant. The affected individuals are of a dark green, and the stem is discoloured. As the ears are issuing from the sheaths, their stalks are of a dark green, but very slender. When the ear has fully grown out, its dull, dirty colour, causes it to be immediately distinguished from the healthy ones, and it soon turns white."--_Essay on the Diseases of Plants._ [61] _Vidi_ understood. [62] "At the close of the year 1665," says Dr. Hodges, "even women, before deemed barren, were said to prove prolific."