_Aphorism_ I. Relative to the Ancient Period 258 _Art._ 1. Common Words. 2. Descriptive Terms. 3. Theoretical Terms. _Aphorism_ II. Relative to the Modern Period 269 _Art._ 1. Systematic Nomenclature. 2. Systematic Terminology. 3. Systematic Modification. _Aphorisms_ (III. IV. V. VI. VII) relative to the Application of Common Words 278 _Aphorisms_ (VIII. IX. X. XI. XII. XIII.) relative to the Construction of New Terms 285 _Aphorism_ XIV. Binary Nomenclature 307 XV. Linnæan Maxims 308 XVI. Numerical Names 309 XVII. Names of more than two Steps 310 XVIII. No arbitrary _Terms_ 311 XIX. Forms fixed by Convention 314 XX. _Form_ of Terms 318 _Art._ 1. Terms derived from Latin and Greek. 2. German Terms. 3. Descriptive Terms. 4. Nomenclature. Zoology. 5. ------------- Mineralogy. 6. ------------- Botany. 7. ------------- Chemistry. 8. ------------- Crystallography. {xxiii} _Aphorism_ XXI. Philological Rules 328 _Art._ 1. Hybrids. 2. Terminations of Substantives. 3. Formations of Substantives (names of things). 4. Abstract Substantives. 5. Rules of derivation from Greek and Latin. 6. Modification of Terminations. _Aphorism_ XXII. Introduction of Changes 341 FURTHER ILLUSTRATIONS OF THE APHORISMS ON SCIENTIFIC LANGUAGE, FROM THE RECENT COURSE OF SCIENCES. 1. BOTANY. _Aphorism_ XXIII. Multiplication of Genera 346 2. COMPARATIVE ANATOMY. _Aphorism_ XXIV. Single Names to be used 353 XXV. The History of Science is the History of its Language 355 XXVI. Algebraical Symbols 357 XXVII. Algebraical Analogies 364 XXVIII. Capricious Derivations 365 XXIX. Inductions are our Definitions 368 {{1}} NOVUM ORGANON RENOVATUM. DE Scientiis tum demum bene sperandum est, quando per SCALAM veram et per gradus continuos, et non intermissos aut hiulcos, a particularibus ascendetur ad Axiomata minora, et deinde ad media, alia aliis superiora, et postremo demum ad generalissima.