For example: the Almighty has endowed man with various faculties, and the perfection of his organism depends on these faculties, as a whole. Now, he may lose a leg, and yet be capable of performing the ordinary duties of life; but this does not prove that he might not perform them much better with both legs. So in reference to the potato. The fact of its ability to reproduce its kind from a small portion of the whole--a mere bud--should not satisfy us that a perfect germ is unnecessary. Then the question arises, How shall we restore the original identity of this valuable article of food? We have, in the early part of this work, recommended the farmers to study the laws of vegetable physiology. This will furnish them with the right kind of information. We would, however, suggest to those who are desirous of making experiments, to comply with the conditions already alluded to, viz., plant a perfect germ, by which means the potato may be improved. Yet, in order to restore its identity, we must commence by germinating from the seed, and plant that on soil abounding in the constituents necessary for its development. Elevated land abounding in small stones, and hill sides facing the south, are the best situations. Potatoes should never be cultivated on the same spot for two successive years. In relation to the insect theory, we would observe, that it throws no light on the cause of the potato rot; for, in its gradual decay, that vegetable undergoes various changes; the particles of which it is composed assume new forms, and enter into new combinations; its elementary substances are separated, giving birth to new compounds, some of which result in an insect. We all know that animal and vegetable bodies may remain in a state of putrefaction in water, and be dissolved in the dust; yet some of their original atoms appear in a new system. Hence the insect theory has no more to do with the cause of the potato rot than the fungus. TREATMENT OF DISEASE IN DOGS. PRELIMINARY REMARKS.