Professor Clarke, of Cambridge University, the celebrated traveller, is the author of the memoir in question; and we must presume that he was ignorant of what had been done by Mr. Hare and myself, or he would candidly have adverted to the facts. It is proper that the public should know that Mr. Hare was the author of the invention, by means of which, in Europe, they are now performing the most brilliant and beautiful experiments; and that there are very few of these results hitherto obtained there, by the use of it, (and the publication of which has there excited great interest,) which were not, several years ago, anticipated here, either by Mr. Hare or by myself. As I have cited only printed documents, or the testimony of living witnesses, I trust the public will not consider this communication as indelicate, or arrogant, but simply a matter of justice to the interests of American science, and particularly to Mr. Hare. BENJAMIN SILLIMAN, _Professor of Chemistry and Mineralogy in Yale College._ ART. XXV. _The Northwest Passage, the North Pole, and the Greenland Ice._ In looking over the foreign journals, we find no articles of intelligence so interesting as those which respect the three subjects mentioned above. Indeed, as they have found their way into most of our newspapers, it is now generally known in this country, that, in consequence of the reported breaking up of the Greenland ice, an expedition has already left England, in two divisions, the one for the purpose of exploring a northwest passage to Asia, around the North American continent, by the way of Davis's Straits; the other, for effecting the same object _by passing over the north pole_.