. Nature . ly elephants, hyraxes, perisso-dactyles, and the South American groups, which arebrigaded as Notoungulata, but likewise sirenians. Muchis to be said both for and against these proposed changes,but space does not admit of discussing the matter, and itmust suffice to add that we find the Primates, with manat the head, forming part of a superorder in the middleof the class instead of standing at the head. Whether weaccept all his views or not, there can be no question thatin this volume Mr. Gregory has accomplished a mostvaluable and important piece of work. R. L. August i8, 1910] NATU
. Nature . ly elephants, hyraxes, perisso-dactyles, and the South American groups, which arebrigaded as Notoungulata, but likewise sirenians. Muchis to be said both for and against these proposed changes,but space does not admit of discussing the matter, and itmust suffice to add that we find the Primates, with manat the head, forming part of a superorder in the middleof the class instead of standing at the head. Whether weaccept all his views or not, there can be no question thatin this volume Mr. Gregory has accomplished a mostvaluable and important piece of work. R. L. August i8, 1910] NATURE 217 THE MINERAL SURVEY OF Cuerpo de Iiigenieros de Minas del Peru contnuesto issue actively its valuable bulletins on miningareas. In No. 58 (lyoS) Mr. A. Jochamowitz reviews themineraj resources of the somewhat remote department ofApurimac, in the mountains south-east of Lima, where therivers run northward along the ranges to join the greatflow of the .Amazon. The level lands are mainly devoted. jtfl^f w from ill;; Lower Cretaceous Coal-beds of Cupisiiique, 1 to the cultivation of sugar-cane for the production ofalcohol; but alluvial gold-areas exist, and gold occurs indecomposed ferruginous zones among the prevalent stratifiedquartzites. Portuguese miners in old days appear to havesecured most of the spoil that could be readily obtained. Mr. E. T. Duenas describes, in Boletin 62, the provincesof Tayacaja, Angaries, and Huancavelica, famous for theirmineral wealth, from silver-lead to mercury and again alcohol is one of the main agricultural pro-ducts, and the soil of the valleys,when watered, is highly sugar-cane crop, however, at pre-sent suffers greatly from locusts. Thethree provinces lie in a basin of theAndes, between Lima and Cuzco, andat the head-waters of the rocks are much faulted, withcrystalline masses thrust in amongthem. A series of slates is regardedas Silurian, and a red-rock series, con-taining salt, and traceab
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