Heat required to melt snow, [134]

evolved by frozen water, its nature and effects, [145]

cut off by cloud and fogs, [145]

Hector, Dr., on Triassic and Jurassic flora of New Zealand, [526]

Heer, Professor, on chalk sea in Central Europe, [93]

Heilprin, Professor, on insects of Bermuda, [269]

on land-shells of Bermuda, [270]

Helianthemum Breweri, [360], [363]

Heliodus, an American fossil, [69]

Helix, [17]