Book Xiv.--Chemistry.

THE ELECTRO-CHEMICAL THEORY.

The Number of Elementary Substances. 625

BOOK XV.--MINERALOGY.

Crystallography. 627 Optical Properties of Minerals. 629 Classification of Minerals. 630

BOOK XVI.--CLASSIFICATORY SCIENCES.

Recent Views of Botany. 631 " " Zoology. 634

BOOK XVII.--PHYSIOLOGICAL AND COMPARATIVE ANATOMY.

VEGETABLE MORPHOLOGY. 636 ANIMAL MORPHOLOGY. 638 Final Causes. 642

BOOK XVIII.

GEOLOGY. 646

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THE SECONDARY MECHANICAL SCIENCES.

HISTORY OF ACOUSTICS.

. . . . . . Go, demand Of mighty Nature, if 'twas ever meant That we should pry far off and be unraised, That we should pore, and dwindle as we pore, Viewing all objects unremittingly In disconnexion dead and spiritless; And still dividing, and dividing still, Break down all grandeur, still unsatisfied With the perverse attempt, while littleness May yet become more little; waging thus An impious warfare 'gainst the very life Of our own souls. WORDSWORTH, Excursion.

. . . . . . Ἐσσυμένη δὲ Ἠερίην ἀψῖδα διεῤῥοίζησε πεδίλῳ Εἰς δόμον ἉΡΜΟΝIΗΣ παμμητόρος, ὁππόθι νύμφη Ἴκελον οἶκον ἐναίε τύπῳ τετράζυγι κόσμου Αὐτοπαγῆ NONNUS. Dionysiac. xli. 275.

Along the skiey arch the goddess trode, And sought Harmonia's august abode; The universal plan, the mystic Four, Defines the figure of the palace-floor. Solid and square the ancient fabric stands, Raised by the labors of unnumbered hands.

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