Professor Rutot examines the Pliocene deposits in England, Miocene in France and Oligocene in Belgium, and finds the same Reutelian type in all. The names Kentian, Cantalian, and Fagnian should therefore be abandoned, for they are only synonyms for Pliocene-Reutelian, etc. It is hard to gain an idea of the enormous duration of human existence thus suggested. But a diagram (Fig. 24) constructed by Professor Penck[32] is appended with a view to the graphic illustration of this subject. The years that have elapsed since the commencement of the Oligocene period must be numbered by millions. The human type would be shewn thus not merely to have survived the Hipparion, Mastodon and Deinotherium but to have witnessed their evolution and the parental forms whence they arose. [Illustration: Fig. 24. Chart of the relative duration of Miocene, Pliocene and Pleistocene time: (From Penck.) 1. Line of oscillation of level of lowest snow-line. (Central Europe.) 2. Localities where 'eolithic implements' occur. 3. Names of representatives of ancestral forms of the modern Horse. The claim of Anchitherium to occupy the position it holds here, is strongly criticised by Depèret. 4. Names of representatives of ancestral forms of modern Elephants. The chart is to be read from right to left. The gradual sinking of the snow-line is to be noticed, and the oscillations of the same line during the Glacial Period are also shewn (cf. Fig. 25).] Such is the principal outcome of the opinions embodied in the tabulation of Professor Rutot. That observer is not isolated in his views, though doubtless their most energetic advocate at the present day. We must admire the industry which has conferred upon this subject the support of evidence neither scanty in amount, nor negligible in weight. But the court is still sitting, no final verdict being yet within sight. While the so-called Eocene eoliths of Duan (Eure-et-Loire) fail to receive acceptance (Laville[33], 1906), even at Professor Rutot's hands (1911), it is otherwise with those ascribed to the Oligocene period. Mr Moir[34] of Ipswich has lately recognised prepalaeoliths beneath the Suffolk Crag (Newbourn) at Ipswich resting 011 the underlying London Clay. Some objections to the recognition of the so-called 'eoliths' as artefacts may now be considered.