168 Prof. Royle’s Lecture on the Great Exhibition of 1851. 
Hnamelling.—"namelling, or the art of fixing colors by melt- 
ing in fire, is of very ancient date: it was practised by the Egyp- 
tians, and carried to a high degree of perfection in Persia. ‘The 
att is known in every part of India, and some exquisite speci- 
mens were sent to the Exhibition, both from Central and North- 
western India. It is chiefly employed in ornamenting arms and 
jewellery, not only in gold, but also in silver. 
ring is hot, with an iron rod applies some of it (the powder) to 
the surface of the glass. 
Pottery, Encaustic Tiles, Cement.—The art of fashioning 
clay into vessels of a variety of shapes, and hardening it by the 
action of heat, is one of the most ancient of the arts. Frag- 
ments of pottery are everywhere found among the ancient cities 
of India, as in those of other parts of the world; pottery, 3 
Brongniart has remarked, affording the best record of the’ 
ages of man, as bones do of the earth. 
