ACCUM, FRIEDRICH, a German chemist, the first promoter of
gas-lighting (1769-1838).


ACCUMULATOR, a hydraulic press for storing up water at a high
pressure; also a device for storing up electric energy.


ACERRA (14), an ancient city 9 m. NE. of Naples; is in an unhealthy
district.


ACETIC ACID, the pure acid of vinegar; the salts are called
_acetates_.


ACETONE, a highly inflammable liquid obtained generally by the dry
distillation of acetates.


ACET`YLENE, a malodorous gaseous substance from the incomplete
combustion of hydro-carbons.


ACHÆAN LEAGUE, a confederation of 12 towns in the Peloponnesus,
formed especially against the influence of the Macedonians.


ACHÆ`ANS, the common name of the Greeks in the heroic or Homeric