You have permitted me recently to publish two short papers in the Geological Magazine in which I have advocated some unconventional views. Perhaps you will allow me to continue my induction.

In the first paper I endeavoured to show that the identity of the living Mammalian fauna of Siberia and North America necessitates our postulating that those areas have very recently, namely, during the Mammoth age, been connected by a land bridge; further that the facts compel us to the conclusion that this land bridge must have been across a portion of the Polar area, and that when it existed comparatively temperate conditions prevailed there.