Sicily, Gesture language in, [295]
Sign language, Abstract ideas expressed in, [348]
, Alaskans, of the, [513]
, Antiquity of, [285]
, Apache pictographs connected with, [372]
, Archæologic research connected with, [368]
, Arrangement in description of signs in, [546]
, Australian, [306]
, Authorities in, list of, [401]