Should he therefore be fortunate enough to make any observations, or indulge in any reflections, in the course of the following chapters, that may merit the attention of the reader, he hopes they may in some degree atone for the many defects which will doubtless be discovered; with a sincere wish, that gentlemen of literature and science, who have made deeper researches than he pretends to, will have the goodness to correct them. The author does not write for Fame: as anonymous compilers (and it is the author's wish to be considered in no other light) can never expect their true names to be inscribed on her records: neither do pecuniary considerations influence him, as he expects to reap no profit from the publication. Should it attract public curiosity to such a degree, as to induce the sale of more copies than will be sufficient to meet the expense of printing, it is the author's desire, and he does hereby direct, and fully authorize the publishers, to pay over the nett profits to Captain Symmes, for the purpose of enabling him further to prosecute his studies; and to aid him in the accomplishment of his designs. Whether Captain Symmes has hit upon an important truth in the economy of nature, as respects the organization of matter, it is not for the author to determine; to the more scientific we must look for a solution of the problem; to them it is submitted. The following pages are presented with no other intention, than as a hint to elicit the attention of others, who are qualified to investigate, and improve the subject. Should they, on examination, consider the matter worthy of their investigation, it will doubtless receive the attention which its importance so greatly demands. If it be erroneous, it is hoped they will detect, and expose its fallacy to the world; giving at the same time rational and satisfactory explanations of the many facts, and appearances which Captain Symmes adduces as proofs of his positions. _August, A. D. 1824._ Apology TO CAPTAIN SYMMES. SIR――