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expression so used. In his frequent, long, and tedious speeches, it has been said that a trope never passed his lips. Bancroft.

Any one of a series of artificial ethereal salts derived from the alkaloidal base tropine.

Not isotropic; having different properties in different directions; thus, crystals of the isometric system are optically isotropic, but all other crystals are anisotropic.

A rope stitched to the edges of a sail to strengthen the sail.

See Breastband.

An instrument for exhibiting certain chromatic effects of light (depending upon the persistence of vision and mixture of colors) by means of rapidly rotating disks variously colored.

n, but which form to the eye regular figures when the card is rapidly revolved. See Thaumatrope.

A figure by which permission is either seriously or ironically granted to some one, to do what he proposes to do; e. g., "He that is unjust, let him be unjust still."

That part of the boltrope to which the lower edge of a sail is sewed.

See Bloodstone (a). Heliotrope purple, a grayish purple color.

The person at a geodetic station who has charge of the heliotrope.

Half turned round; half inverted; (Crystallog.) having a twinned structure.

A device for raising water by the direct action of steam; a pulsometer.

One of a pair of a paired organs.

See Rheotrope.

An instrument for reversing the direction of an electric current. [Written also reotrope.]

An instrument for signaling by reflecting the rays of the sun in different directions. Knight.

An optical instrument or toy for showing the presistence of an impression upon the eyes after the luminous object is withdrawn.

An optical toy, in which figures made to revolve on the inside of a cylinder, and viewed through slits in its circumference, appear like a single figure passing through a series of natural motions as if animated or mechanically moved.

us stone sprinkled with red jasper, as if with blood; hence the name; -- called also heliotrope.