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The American Cyclopedia, its Index and Animal Supplemeuts. New York D. Appleton & Co. This Cyclopedia has been inore wklely known for more than a qnarter of a century In all parts of the country than any other of its kind. It is to be found, we presume, in all public libraries; and it is astonishing to learn into what a vasi number of private libraries, liouseholi and professional, it has been introduced. This fact shows conclusively in whai estiimition the Cyclopedia is held by the great body of our intelligent people. It also shows that to meet the greatest wanl of such a public, a cyclopedia must be popular in style, and, in its treatment of topics, must becompreheusive, presenting In due proporttOD the more important facts and the salient features, anU reserving exhanstive and technical discussions tor special treaiises. When the sixteen volumes of this great work - In their revised form - were completed in 1870, the American public, tinding the Cyclopedia, as a whole, to possess those requisite characters, gave it thair strongest ndorsement by giving it au ui.precedented patronage. That extraordinary patronage still continúes. And this for the good reason that the publishcrs are constantly supplementingand enriching their Cyclopedia. They have issued up to this time the following additional volumes, uniform in size and binding witli the sixteen constituting the body of the work : (1) An index volume, by the use of wliicli the inqulrer will find whether what he seeks is contained in some leading article, or scattered through diflerent volumes, or is accidentally given in connection with another subject. (2) A series of annual volumes, six in number, up to the close of 3881, in which all new facts of history, the records of religious movements, science, politics, biograpliy, literatura, education, reform, juiispnklence, railroads, telegraphs, manufactures, etc., are duly noted. This process of supplementation, by the annual issue of one royal octavo volume of about 800-900 pages, is to continue. The Cyclopedia, on this plan, will never' lecotne obsolete, and never giow old. (Vith an index volume (supplementary or evised) every ten years, easy reference o all the information on any topic scatered through the different volumes can e secured. These supplementary volumes are inval uablu to all persons who requi re to lave at hand a condensed and carefully ilaborated annual record of all important acts in the history of each and every ountry on the globe. Indeed, as books of reference they are indispensable to all iich persons. And probably no volumes )f the Cyclopcdia are moie sought for by hose who are qualilied to appreciate their erviceablene8s. A good cyclopeilia, Iike a good dictionry, is not a luxiuy, bnt a prime iiect-sIty for tlie acholar, the writer for the )ublc presa, and for sil persons wlio deire to possess the most eonvenient work f reference. And that the American Oyclopedia meets tite wants of the arerge American scholar and professional is fact wliich its general popularity añil ery large sale put beyond question.