LX. Table of the Regular Terminations of the Four Conjugations; Formations of the Tenses; Unipersonal Verb y Avoir.... Fables...... 126 LXI., LXII., LXII., LXIV., LXV., LXVI., 1.XVII., LXVIII., LXIX. Alphabetical Table of the Irregular, Defective, Peculiar, and Unipersonal Verbs 140,160, 178, 187, 203, 221, 237, 265 .......187, 222, 238, 266, 322 LXX. Participles; the Adverb. SYNTAX, th: Noun.... 281 LXXI. The Article and its Uses....... LXXII., LXXIII. The Adjective and its Peculiarities ..312, 330 LXXIV., LXXV., LXXVÏ. Numeral Adjectives; Pro...............336, 350, 367 383 nouns LXXVII. The Use of the Tenses 298 LESSONS IN GEOGRAPHY. 168 II. Examples of Entries in the Day-Book, Journal, Cash-Book and Ledger Skeleton Maps of Europe and Asia, and Maps of Polynesia, England and Wales, Scotland and Ireland: Latitudes and Longitudes, Boundaries, Divisions, Seas, Straits, Gulfs, Islands, Peninsulas, &c. to be prefixed to the Volume. 206 .... 226 XXII. Explanation of the Map of Asia, Ethnography.... XXIII. Explanation of the Map of Africa; table of the Countries, Kingdoms, Empires and States of Africa; Ethnography 29 61 ..... III. Principles, and Rules for finding the Debtor and LESSONS IN CHEMISTRY. 263 293 339 IX. Perspective. Section III. ages X. Proportions of the Human Head and Face ... XI., XII., XIII. On Trees and their Append XLII. Inflexion. Nouns, their Origin and Classes, Nouns XLIII., XLIV. Names of Persons in various lan XXIV. Explanation of the Map of North America; table of the Countries, Kingdoms, Empires, and States in North America XXV., XXVI. Explanation of the Map of North America Continued; Ethnography XXVII., XXVIII. Explanation of the Map of South America; table of Countries, Kingdoms, Empires and States in South America 116 143 .249, 311 XXIX. Explanation of the Map of Australasia; Table of Countries, Colonies and Settlements in Austra lasia 345 XXX. Explanation of the Map of Polynesia; Table of Colonies, Settlements and Countries in Polynesia 361 LESSONS IN GEOLOGY. XXIX. On the Denuding Agency of the Ocean XXX. On the Production of Ripple Marks XXXI. On the Distribution of Drifts and Boulders XXXII. On the Weathering of Rocks..... XXXIII. On the Production of Landslips 1 52 97 121 155 XXXIV. On the Effects of Electric Discharges upon Rocks 189 Educator LESSONS IN GEOLOGY.-No. By THOMAS W. JENKYN, D.D., F.R.G.S., F.G.S., &c. THE ACTION OF CHAPTER II. SECTION XIII. EARTH'S CRUST. ON THE DENUDING AGENCY OF THE OCEAN. rather than excavating, their beds. In most longitudinal valleys, which form the bed of the principal river, there are frequently transverse valleys which run across them in such a way, that the water must have originally passed through them Depressions of land, called valleys, are not always easily instead of excavating their present channels. diversity of origin. Mountain valleys resemble large cracks accounted for. The diversity of their form would suggest a Fig. 66. The Denudation of Rocks in Suzen Switzerland. In a former lesson, I intimated that the formation of valleys was a difficult problem in geology. It is evident that rivers, In general, have not excavated their own beds, but flow in valleys which have been formed, for the most part, by other agents. In the majority of instances, rivers are filling up, VOL. III. | produced in the strata of the earth's crust, either when LII. Declension of Foreign and Proper Nouns LIII. Declension of Adjectives LIV. Mixed Declensions, Comparison of Adjectives LV. Declension of Comparatives and Superlatives LVIII., LIX., LX. The Pronouns LXI. Verbs, Participles, Auxiliary Verbs.. LXII., LXIII. Paradigms of the Auxiliaries of the First LXIV. Conjugation of Verbs; Tense-Endings LXV. Paradigm of Verbs of the Old Conjugation I., II., III., IV., V., VI., VII., VIII., IX., X., XI., Multiplying Money by Money, Activity and Zeal, Exhortation to all, 27. Co-instruction Societies, 43. Self-Education, 59. To increase our Circulation, the Pythagorean Theorem, 103. Phonetic Short- 17 Hand, 135. Training-Colleges, Elocution, 179. Certificates of 37 Merit, List of Training-Schools, 223. Acquisition of French, 283. 70 French, English, and Welsh Words compared, 315. Chemistry, Government Stock, Solution of "Lean Horse" Query, the Cube of a Residual, &c., 28. Arithmetical Questions solved, Plants for a Bower, &c., 44. Solutions of Arithmetical Questions, 60. Prices of Globes, Solution of Query, &c., 76. On Eloquence, Exponentials, Ship Query, Solution of a Cubic Equation, &c., 120. Arithmetical Order of Mathematical Studies, Arithmetical, Algebraical, and Geometrical Queries, 164. Difference between the Aristotelian and Platonic Philosophy, Cause of the Tide, Prices of Electrical Machines and Batteries, 180. Analytical Table of the Bible, 196. Mutual Instruction Societies, Meaning of Baptizo, 256. Lines on Winter, Inland Book Post, 300. Answer to the Query on the Creation of Light, 316. Arithmetical Query, A Cry from our Prisons, 57. Poems by Blackman, 59. Uni- versity of London, Nos. III., IV., 119, 295, 323. The Missionary LESSONS IN GEOLOGY.-No. XXIX. By THOMAS W. JENKYN, D.D., F.R.G.S., F.G.S., &c. THE ACTION OF CHAPTER II. WATER SECTION XIII. EARTH'S CRUST. ON THE DENUDING AGENCY OF THE OCEAN. rather than excavating, their beds. In most longitudinal val- The Denudation of Rocks in Suzen Switzerland. In a former lesson, I intimated that the formation of valleys was a difficult problem in geology. It is evident that rivers, in general, have not excavated their own beds, but flow in valleys which have been formed, for the most part, by other agents. In the majority of instances, rivers are filling up, VOL. III. | produced in the strata of the earth's crust, either when |