The subject of _American Antiquities_ has been very much neglected by American writers. Even the remains of an ancient and high civilization which are scattered so profusely all through Mexico and Central America have hitherto been illustrated almost exclusively by foreigners, and the most complete and magnificent publication respecting them that will ever have been made is that of Lord Kingsborough. Recently, however, our own country has furnished an antiquary of indefatigable industry, great perseverance and sagacity, in Mr. E. G. Squier, who was lately _Charge d'Affaires_ of the United States to the Republic of Central America, and is now engaged in printing several works which he has completed, in this city. The splendid volume by Mr. Squier which was published two years ago by the _Smithsonian Institution_, upon the Antiquities of the Valley of the Mississippi, illustrates his abilities, and is a pledge of the value of his new performances. The first of his forthcoming volumes will, like that, be issued by the Smithsonian Institution, and it will constitute a quarto of some two hundred pages, with more than ninety engravings, under the title of _Aboriginal Monuments of New-York, comprising the results of Original Surveys and Explorations, with an Appendix_. This is now, we believe, on the eve of publication. A second volume is entitled, _The Serpent Symbol, and the Worship of the Reciprocal Principle, in America_. It contains, also, extended incidental illustrations of the religious systems of the American aborigines, and of the symbolical character of the ancient monuments in the United States. It will form a large octavo of two hundred and fifty pages, with sixty-three engravings, and will be published by Mr. Putnam.