IN bringing our Fourth Volume to a close, we heartily thank all our Subscribers for their steady and unwearied support. The letters of encouragement and of commendation which we have received during the past six months, have been more numerous and more gratifying than ever. We have endeavoured to show our sense of these favours, by labouring more earnestly to impart solid and useful instruction in various important branches of learning; we have, in fact, considered that we were entrusted by our readers with the responsible task of their education, and we `ave aimed at fulfilling our duties to their satisfaction. We have given a concise and popular summary of the leading facts in several branches of Natural Philosophy, as may be seen by consulting the Index; but many highly useful and interesting departments are soon to follow in their order; these are Caloric and Optics, or the doctrines of Heat and Light, including some of their most interesting applications, as the Steam Engine, the Telescope and Microscope, Daguerreotype and Photography; Magnetism and Electricity, including the nature of the Telegraph, the Electrotype, and other useful applications; and, as soon as possible, Astronomy, which is much in demand. Chemistry has also been treated in a highly popular manner, and has converted a great number of our Subscribers into practical Students of that art. The elegant languages of ancient Greece and of modern Rome have also occupied our pages, and have been expounded with great care by the authors of the Lessons on these branches of Literature; nor have we forgot our Students in French, as a "Course of Readings" in that popular language is still appearing at convenient intervals. The Mathematics, including Algebra and Geometry, with Instrumental Arithmetic and Mathematical Illustrations, have also been progressing under our own care, and these branches will be still more vigorously pursued in our next Volume, where some of them, if possible, will be brought to a conclusion. Bookkeeping has already occupied a portion of our labours, and we shall conclude this branch in a few early Numbers, with the subject of Foreign Trade. The Lessons in Reading and Elocution will be rendered still more useful and attractive in our next Volume; but we cannot promise any new language till we have finished one or more of those now in hand; the German, however, is very near a conclusion. We are preparing for Lessons in Mechanical Drawing, and in various other branches which have been unavoidably, postponed, on account of the great demand for those which we have given, and which we are now carrying on. In closing these remarks, we can only say that we shall continue to place before our Readers, as we have always striven to do, those subjects which are the most in demand, and which are calculated to do "the greatest possible good to the greatest possible number.” LXXVIII. The Infinitive; Government of Verbs; etc LXXXI. Adverbs of Negation; the Preposition 33 LXXXIII. Rules and Observations relating to Nouns, etc. 325 48, LXXXIV. The Pronouns; the Adjectives; the Verbs 339 LXXXV. Use of the Tenses; Rules and Observations.... 358 79 LXXXVI. The Tenses; Participles; Adverbs; Preposi- 26 VIII, IX., X., XI. The Third Declension; Paradigms 10,39, 55, 71 51 67 Declensions reviewed; Exercises, etc......97, 115 XIV., XV. Comparison of Adjectives; General View 124, 170 XVI. Adverbs; Comparison of Adverbs XVII., XVIII. The Pronouns; Personal; Reflective ; Reciprocal; Possessive; Demonstrative; Rela- ... V. Of Diphthongs; Third Pronouncing Table VII., VIII. Fifth Pronouncing Table IX. Sixth Pronouncing Table, Accents, etc... X. On the use of the Apostrophe XI., XII. The Articles; Declension of Nouns XVI. Use of the Particle a: Vocabulary LESSONS ON MUSIC. XX. Introduction to the Old Notation; Relative Length of Notes; Absolute Length of Notes and Speed of Movement; Pauses of the Voice; Time Signatures; Absolute Pitch and Clefs; XXI. Of accidendal Flats and Sharps, and Rules for recognising on the Staff the Notes of Tran- sition, the Distinguishing Notes of Minor 103, 110 133 147 XXII. The Condenser; Condensing Syringe; Condensed Air Fountain; Air-gun; Hero's Fountain; Intermittent Fountain; Siphons XXIII. Pumps; the Suction-Pump, Forcing-Pump, XXIV. Acoustics: Production, Propagation, and Reflec- tion of Sound; Intensity of Sound; Savart's Apparatus for Increasing Sound; Effect of Tubes; Velocity of Sound; Laws of Reflected XXV. Echoes and Ringing Sounds; the Speaking and Hearing Trumpets; Vibrations of Cords; the Monochord; Nodes and Nodal Lines; Savart's 356 181 XXVI. Physical Theory of Music; Quality of Musical LESSONS IN READING AND ELOCUTION. VI. Laws of Gravity; the Pendulum. X. Bodies immersed in Liquids; Principle of |