306. Laxey wheel, _380_, 381. Leads, 208. Lenses, 231; correction of for colour, 240, _241_; focus of, 236; rectilinear, _245_; spherical aberration and distortion of image. Nor.

• The dialectic strife in Byzantium, the decline.
• As President, and the question of his.
• Of Schulze was due to vibratory motion.