CUBHING. ] 



EVOLUTION OF FORMS. 



499 



smoothed while still plastic without danger of distortion, no matter what 

 its size, if supported at the bottom in a basket or other mold so that it 

 may be shifted or turned about without direct handling. (See Fig. 526.) 



Fig. 52C. — Basket-bowl as base-mold for large vessels. 



After this discovery was made, the molding of large vessels was no 

 longer accomplished by the spiral method exclusively. A lump of clay, 



Fig. 5'27. — Clay nucleus for a vessel. 



hollowed out (see Fig. 527), was shaped how rudely so ever on the bot- 

 tom of the basket or in the hand (see Fig. 52S), then placed inside of a 



Fir,. 528. — Clay nucleus shaped to form the base of a vessel. 



Hemispherical basket-bowl and stroked until pressed outward to con- 

 form with the shape, and to project a little above the edges of its tern- 



