on Scleroderma, [536]
Astroma, [300]
Asymmetry, [216]
Athalia (centifoliae) spinarum, [515]
Atropinae, [394] f.
Atropos divinatoria, [394] f., [396]
Atta (Oecodoma) cephalotes, [501]
Attitude, [248], [250], [256], [268], [514]
Attraction of light, [230]
Auditory organ, [400];