Controverted Questions of Geology. By Joseph Prestwich, D.C.L.
(Macmillan and Co.)—Dr. Prestwich has collected here six articles, the first of them from the Nineteenth Century, the second from the Journal of the Geological Society, the third from the Journal of the Anthropological Institute, and the remainder from the Procee,dings of the Royal Society. The first is a general survey of the state of Geological Science, the second deals with the great question, of importance transcending all others, of the
Antiquity of Man. This is argued in considerable detail from the point of view of the Glacial Periods. Dr. Prestwich is dis- posed to bring these within a smaller distance of time than geologists commonly assign to them. The maximum antiquity of Paleolithic man he puts at 47,000, the minimum at 1,000, years. The second paper deals with the " Primitive Character of the Flint Implements of the Chalk Plateau of Kent." The "Agency of Water in Volcanic Eruptions" is the subject of the fourth. The "Thickness of the Earth's Crust and Underground Tem- peratures" are the subjects of the fifth and sixth essays.
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