of Tertiary and Secondary periods, [199], [202]
of the Secondary and Palæozoic epochs, [200]
change of, during Tertiary and Secondary Periods, [200]
affected by arrangement of the great continents, [205]
nature of changes of, caused by high excentricity, [230]
exceptional stability of the present, [232]
changes of, as affecting migration of plants, [517]
Climatal changes, [106]
change, its essential principle restated, [158]
changes as modifying organisms, [229]