The Scientific American comments with much good sense and consistency upon the unthinking enthusiasm with which certain papers give an account of the experiments made at the present time, in one of the New York docks, with a hot air engine, which has been placed in a splendid vessel. Not that Messrs. Munn A Co. have any ill-will towards Mr. Ericssons invention ; quite the reverse,but they are right in display ing caution, and in advising a similar course to their less competent co-editors in such matters. If, as it is to be hoped the Caloric Steamship succeeds in the experiments that are being made, the new motor will make its own character lor itself without the assistance of others. Ot all things, keep us from imprudent friends. The above extract is translated from the Invention, an excellent and ably conducted monthly periodical, published at Paris by M. Gardiseal, and devoted to industrial, mechanical, and scientific objects in general. The same journal likewise notices our remarks on the injustice of the law, by which the foreign inventor is mulcted in the sum of $100, when his claim has been refused,—as well as on the necessity of lowering the fees to English subjects, now that England has given the initiative.