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It has been advanced, in reply, that the granitic formation of Cornwall may not be analogous to that of other countries : it has also been suggested, that I have greatly erred in sup posing the circumstances of this narrow peninsula to be appli cable to all granitic districts; and that a more extended knowledge would lead me to confess, with the peasant Tityrus, « Urbem, quam dicunt Romam, Meliboee, putavi Stultus ego huic nostrcc similem.” This censure, however, has been expressed in the most court eous terms ; and certainly the position into which I ventured, as an opponent of generally received principles, fairly exposed me to such reproof: but this would not have been so strongly called for, if the limits of the channel through which my dis sent was made public had permitted me to enter more fully on the subject. Now, however, no such restraint can operate, and, by freely quoting the works of those geologists who have most carefully examined the primary rocks, I shall endeavour to show that the geological structure of Cornwall is similar to that of other granitic districts. Having failed in my first attempt to induce geologists to enquire into the validity of these objections, — which indeed bear on the fundamental principles of the science, — I, in the next place, invited the geological section of the British Asso ciation at Cambridge to discuss this subject, being prepared to maintain my position, not only by reference to Cornwall, but also by arguments derived from the published descrip tions of other countries. Circumstances, which need not be here mentioned, prevented this proposition from being then entertained; but it was appointed that the matter should be fully discussed at the succeeding annual meeting, which is to be held at Edinburgh during the present year. In consequence of this resolution, I now publish an ex position of my objections to the Plutonic theory, with the intent that the members of the Association may clearly under stand the grounds of dissent, and come prepared to examine