Almagest, a. [170].
Almanac, a. [181].
Alphonsine tables, a. [178].
Alternation (of formations), b. [538].
Amphoteric silicides, b. [352].
Analogy (in Natural History), b. [418].
Analysis (chemical), b. [262].
Analysis (polar, of light), b. [80].
Angle of cleavage, b. [322].
Angle of incidence, b. [53].