ice, of which the stone-ice beds of New Siberia and Eschscholtz Bay are remains. Of these strata the frozen loam deposits over the stone-ice, containing the willow and the alder, are doubtless Interglacial. Some of the remains of the alder are in such wonderful preservation that there are still leaves and whole clusters of catkins on the branches. The land-mass to which the present New Siberian Islands belong was only dismembered at the end of the Interglacial Period, when colder sea-currents procured an entrance, and the accumulation of snow-masses diminished simultaneously with the sinking of the land, whereas the cold increased. The flora died off, says Von Toll, and the animal world was deprived of the possibility of roaming freely over vast areas. Only one representative of the great Drift fauna, the musk-ox, has been able to preserve its life to the present day on the larger remnants of its former vast home, such as Greenland and Grinnell Land. [Sidenote: Remains of the Ice Age] As we have said, the geological and climatic conditions in all regions of the earth affected by the Glacial Period were closely similar to those just described. In other places the Drift stone-ice has long disappeared, but the ground-moraines of the former inland ice-masses, and the surface-moraines (terminal and lateral) of the former gigantic glaciers, constitute its unobliterated traces. On the moraines of the earlier Glacial Period we find the strata of the Interglacial Period deposited, and on the later moraines of the second (last) Glacial Period lie the remains of the post-Glacial Period, in the course of which a continual increase in the yearly temperature--probably only a few degrees of the thermometer--caused the glaciers to melt and retreat, and opened the way for the return of plants and animals to what had been deserts of snow and ice. The place formerly occupied by the Interglacial and Glacial fauna is then taken by the post-Glacial fauna, which proves considerably different.