Age, of strata, [38], [52].

Aggradation, [162].

Aktian deposits, [36].

Alaskan coast, map of, [79].

Albs, [376].

Alden, W. C., cited, [316], [318], [319].

Algæ, growth of, in hot springs, [194].

“Alkali” in deserts, [201].

Alluvial bench, [214].

Alluvial cone, [213].