The principles of Derivation, and of Orthographic Analysis, are brought within the comprehension of the youngest learner. _From Forty-four Teachers of Public Schools, Pittsburg, Pennsylvania._ "The undersigned have examined Covell's Digest of English Grammar, and are of opinion that in the justness of its general views, the excellence of its style, the brevity, accuracy, and perspicuity of its definitions and rules, the numerous examples and illustrations, the adaptation of its synthetical exercises, the simplicity of its method of analysis, and in the plan of its arrangement, this work surpasses any other Grammar now before the public; and that in all respects it is most admirably adapted to the use of schools and academies." _From _JOHN M. WOLCOTT, A.M._, Principal and Superintendent of Ninth Ward School, Pittsburg, Pa._ "Covell's Digest of English Grammar not only evinces the most unceasing labor, the most extensive research, the most unrelaxing effort, and the most devoted self-sacrificing study of its author, but it is the most complete, the most perfect, and, to me, the most satisfactory exposition of English Grammar that has come to my notice. It appears to me that every youth aspiring to become master of the English language, from the rudimental principles to the full, round, beautiful, faultless, perfect period, will make this volume his '_vade mecum_.'" * * * * * Natural Philosophy: EMBRACING THE MOST RECENT DISCOVERIES IN THE VARIOUS BRANCHES OF PHYSICS, AND EXHIBITING THE APPLICATION OF SCIENTIFIC PRINCIPLES IN EVERY-DAY LIFE. ACCOMPANIED WITH FULL DESCRIPTIONS OF EXPERIMENTS, PRACTICAL EXERCISES, AND NUMEROUS ILLUSTRATIONS. BY G. P. QUACKENBOS, A.M. 12mo. 450 pages. Price $1 25. This book, which is illustrated in the most liberal manner, is equally adapted for use with or without apparatus. It is distinguished 1. For its remarkable clearness. 2. For its fullness of illustration. 3. For its original method of dealing with difficulties. 4. For its correction of numerous errors heretofore unfortunately stereotyped in School Philosophies. 5. For its explanation of scientific principles as they appear in every-day life. 6. For its practical application of these principles in questions presented for the pupil's solution. 7. For a signal perspicuity of arrangement. One thing being presented at a time and everything in its proper place, the whole is impressed without difficulty on the mind. 8. For the interest with which it invests the subject. From the outset, the student is fascinated and filled with a desire to fathom the wonders of the material world.