Arms and hands, free use of, indirectly correlated with diminution of canines.
Arrest of development.
Arrow-heads, stone, general resemblance of.
Arrows, use of.
Arteries, variations in the course of the.
Artery, effect of tying, upon the lateral channels.
Arthropoda.
Arts practised by savages.
Ascension, coloured incrustation on the rocks of.
Ascidia, affinity of the lancelet to; tad-pole like larvae of.