an instrument anciently used for the measuring of time.

The hydroscope was a kind of water-clock, consisting of a cylindrical tube, conical at bottom: the cylinder was graduated, or marked out with divisions, to which the top of the water becoming successively contiguous, as it trickled out at the vertex of the cone, pointed out the hour. See Hydrostatics, sect. vi.

END OF THE EIGHTH VOLUME. ### DIRECTIONS FOR PLACING THE PLATES OF VOL. VIII.

| Part I | Page | |--------|------| | Plate CCXXII. to face | 28 | | CCXXXIII. | 116 | | CCXXXIV. | 197 | | CCXXXV. | 201 | | CCXXXVI. | 317 |

| Part II | Page | |---------|------| | Plate CCXXXIX. to face | 449 | | CCXXX. | 457 | | CCXXXI. | 460 | | CCXXXII. | 464 | | CCXXXIII. | 468 | | CCXXXIV. | 541 | | CCXXXV. | 566 | | CCXXXVI. | 708 | | CCXXXVII. (Historical Chart referred to p. 561, col. i.) | 600 |

(In all sixteen Plates.)