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Rh of a more stimulant quality, administered in a cell of larger dimensions, should give full development to organs which, by the ordinary treatment, would have remained but partially expanded, we can readily comprehend; but that such extra supplies of food and space should effect an absolute change in the anatomical structure and instinctive propensities,—should produce a more slender proboscis, deprive the transformed insect of the downy brushes at the joints of her limbs, and of the basket-shaped cavities in the posterior pair, for retaining the pellets of farina,—and, above all, should effect so great an alteration in her instincts, rendering them in numerous particulars entirely different from those of the worker class, for which she was originally destined,—these are circumstances which, notwithstanding all our researches, are still involved in mysterious obscurity, and furnish ample scope for future investigation. On the Architecture of Bees.—The peculiarities of instinct in the different orders of animals, if pursued through all its variations, would supply us with an inexhaustible fund of admiration and instruction; and in none of the lower animals is this wonderful faculty more worthy of our notice and investigation than in the Bee. So much, however, has been already written on this particular point, that the subject is pretty nearly exhausted. We should perhaps find, notwithstanding, but little difficulty in treating our readers with an additional disquisition on the same subject, but as we do not pretend to be able to give a more satisfactory elucidation of the mystery of