In the foregoing illustration, I have assumed that at the commencement of our imaginary Glacial period, the arctic productions were as uniform round the polar regions as they are at the present day.
Aurreko adibidean suposatu dut gure irudizko glaziaraldiaren hasieran ekoizkin arktiarrak poloinguruko eskualde guztietan egun bezain uniformeak zirela.