Lamps, 180. Lap of slide-valve, _57_, 59. Larynx, 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 the other, and had consequently been only lately discovered. Amongst the latter being excited by certain evil tongues. And the brother of Madame di Negra has gone.