tropical character of flora, [500]

tropical genera common to Australia, [501]

temperate species common to Australia, [502]

route of Arctic plants to, [521]

European plants in, [509]

endemic genera of plants in, [526]

great antiquity of, [526]

Nordenskjöld, Prof., on absence of perpetual snow in N. Asia, [135]

on recent milder climate in Spitzbergen, [182]

on former Polar climates, [187]