TO M. HOLLYDORF, _Director of the Animalculan Corps of the R. H. B. Society, at present conducting their explorations in the newly discovered city of Heraclea Doweri, in the country of the wild hordes in the Andean region of La Plata._—Greeting, in behalf of our patrons and members of the Society, with personal congratulations! Wonder and surprised amazement are terms of too weak invention to express the emotional excitement caused by your letter of discovery, which reached us with unaccountable despatch. The introduction,—although conducted with consummate skill, that our credulity might not be overstrained by the relation of concurring events in a manner too abrupt,—was of a character so startling that our mouths unconsciously retained the smoke of our pipes, to be emitted in the full volume of accumulation with an involumed sigh of relief, when impressed with the conviction of your sanity. It appears from your relation, that your progress was attended by concurrent events of the most surprising description, which by a conjunction of circumstances, when subject to opposition, were readily overcome, with an effect that tended to the final development of the Animalculan race of humanity. The train with the slightest descriptive discrepancy would have consigned your letter to the basket as a maniacal production. As it was, with the first announcement, all eyes became fixed upon the reader in mute astonishment, too deeply impressed for skeptical thought, or incredulous comparison; the valves of respiratory emotion continued closed to voluntary exercise, with singular endurance, until the last sentence of your letter opened their vent with a prolonged whe-w accompanied with a volume of condensed smoke commensurate with the capacity of each member for marvelous inflation. Before proceeding to the theoretical discussion, and precedental comparison of your revelations with those of past ages, the members indulged in a variety of extra-scientific ejaculations decidedly foreign to your Manatitlan code of educational ethics.