Nature . gently sloping plainof volcanic deposits, among which pumice, like thatwhich buried Pompeii in the year -o, would be con-spicuous, as well as the products of other Vesuvian andCampanian eruptions. The strata of the little rock dip inthe same direction as those of the Sorrentine peninsula,viz. to the north-west, and they indicate by their trendthe existence of a great fault, all other trace of which isburied beneath the alluvial and volcanic deposits of theSarno-< lastellamare plain. lli. granitoid and Filonian Rocks of Sardinia form thesubject of a posthumous memoir of Carlo Riva (
Nature . gently sloping plainof volcanic deposits, among which pumice, like thatwhich buried Pompeii in the year -o, would be con-spicuous, as well as the products of other Vesuvian andCampanian eruptions. The strata of the little rock dip inthe same direction as those of the Sorrentine peninsula,viz. to the north-west, and they indicate by their trendthe existence of a great fault, all other trace of which isburied beneath the alluvial and volcanic deposits of theSarno-< lastellamare plain. lli. granitoid and Filonian Rocks of Sardinia form thesubject of a posthumous memoir of Carlo Riva (No. 9,in8 pp., 7 , which has hern prepared for the press byhis friend and colleague Prof, de Lorenzo. After describingthe petrographical characteristics of the chief varieties ofrock in detail, the author gives a valuable account ofseventeen localities in Sardinia where zones I contactbetween the granites ami schists and calcareous rocks majbe well studied, together with an appreciation of the meta-. morphic changes that have taken place at each memoir concludes with a discussion of the theoriesof the probable age of the granitoid rocks of Sardinia. Dr. V. Bianchi has re-investigated certain parts oi thebrain of Delphinus delphis (No/ 14, 16 pp., 3 pis.), andhas compiled an interesting table setting forth his estimatesof the relative numbers of neuroglceal corpuscles and ofnerve cells in various regions of the cerebral cortex. !28 NA TURE [February i, 1906 Although the cerebral hemispheres resemble those of thecarnivorous type, yet the frontal lobes are so singularlyunder-developed that the author finds therein an explan-ation of the relative stupidity of the dolphin. Bidders Organ (Spengel) was discovered in 1758 byRosel von Rosenhof upon the testes of Bufo Attilio Cerruti, by means of material captured in thevolcanic crater of Archiagnano, near Naples, has been ableto demonstrate a highly interesting cytological processwhich occurs in the male i
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