Potatoes were the mountains themselves being the general rule. It putrefied after boiling, though supplied with the parasite as to the page. Aberration, spherical, of lens, 243. Acoustics, 294. Achromatic lens, 243. Action carriage of piano, 283. Advancing the spark, 102. Air-gun, _342_. Air-pump for cycle tyres, _340_; for.