There are complaints, and those by far too frequent, where no known process has a claim to the title of _remedial_. Here the whole chance of preservation depends on the physician’s capacity for bringing together facts that have heretofore stood remote. But no power of combination can avail where there are no ideas to combine. Every new observation therefore, may be considered as a standard trunk, sending forth analogies as so many branches crowned with blossoms, some of which cannot fail to be succeeded by salutary fruits. And were it not absurd to extend the illustration of so plain a point, it might be added, that when by the continual interposition of new trunks, the branches are brought near together, the produce of each will be ennobled by the action of their respective principles of fecundation. Whenever the author has been able to obtain certain information concerning any unusual appearance in animal nature, it has been his custom to preserve it; and among his papers he has memorandums which prove that to our present circumscribed ideas concerning the dose of medicines may be sometimes imputed failures in practice; that certain signs are not to be taken in the received signification; and that many measures are adopted or omitted to the detriment of invalids, because it is assumed that circumstances are necessarily connected which may exist separately, or that one given natural operation is inconsistent with another, to which it may really be synchronous or next in order. Assiduous observation of the daily states of the human microcosm will be the unfailing consequence of attention to its striking phænomena. Such is the progress of curiosity. Such the origin of all the sciences. The more uniformly clear the sky under which they tended their flocks, the less likely were the shepherds of Chaldæa, to found the science of the stars. And however the disposition to study astronomy might have been strengthened by the coincidence between the heliacal rising of Sirius and the overflowing of the Nile, it must, I conceive, have been awakened by the aspect of meteors and eclipses.