50 EXERCISE. 



Glyptog^'raphy (Gr. glnptos, engraved, and grapM, descrip- 

 tion). — A description of the art of engraving upon gems. 



Gypsog'raphy (Gr. gupsos, gyp.sum, and grapko, I engrave). — 

 'J'lie art uf engraving on gi/psimi. 



Hatching". — A mode of executioti in engraving in which the 

 eiiect is produced by courses of lines crossing each other at 

 angles more or less acute. 



Heliogra'vure (Gr. helios, the sun, and grapho, I engrave). — 

 Tlie art of phofograjyhic engraving. Tiiere are two sorts of 

 heliogravure, — that which prints like a copper-plate, and 

 that which prints like a woud-cut. 



Hyalog'raphy (Gr. hitalos, glass, and grapho, I write). — The 

 art of engraving on glass. 



Impast'ing'. — An intermixture of lines and points to represent 

 thickness or depth of coloring. 



Lithog'raphy (Gr. lithos, a stone, and grapho, I write). — The 

 art of tracing letters, figures, or other designs on stone, and 

 of transferring them to paper by impression. 



Mezzotin'to (It. half-tinted). — A particular manner of en- 

 graving by an artificial disposition of the shades and 

 different parts of a figure, on different plates. Mezzotintos 

 are printed in colors so as to represent actual paintings. 



Proof. — An early impression taken, as from an engraved plate, 

 lithographic stone, and the like. 



Siderog'raphy (Gr. sideros, steel or iron, and grapho, I en- 

 grave j. — The art or practice of engraving ou steel, by means 

 of which impressions may be transferred from a steel plate 

 to a steel cylinder in a rolling press of a particular construc- 

 tion. 



Stip'pling. — A method of engraving in dots, as distinguished 

 from etching in lines. 



Xylography (Gr. xulon, wood, and grapho, T engrave). — The 

 art of cutting figures in wood, in representation of natural 

 objects ; icood-engraving. 



Zincography. — Engraving ou zinc in the style of wood-cuts. 



EXERCISE. 



Calisthenics (Gr. hdos, beautiful, and sfhenos, strength).— 

 The art, science, or practice of healthful exercise of the 

 body and limbs, to promote strength and graceful move- 

 ments. 



