626 PETROLOGICAL ABSTRACTS AND REVIEWS 



RiES, Heinrich. Building Stones and Clay Products. John Wiley 

 & Sons, New York, 1912, 8vo, pp. xvii+415, figs. 20, pis. 59. 

 $3 . 00 net. 



A handbook for architects. In Part I the important building stones 

 'of the United States are discussed with regard to their desirabiUty as 

 structural material, and with brief petrographic descriptions. 



Part II opens with a chapter on the properties of clay, following 

 which the clay products used as structural material are taken up and 

 discussed, chiefly in their technologic aspects. 



The principal interest to the geologist is found in the rather complete 

 catalogue of quarries, with brief description of the stone obtained and 

 lists of various structures in which these stones have been used. 



The work is not intended as an exhaustive treatise, but aims to give 

 mply the fundamentally important facts, and in this it seems to be 

 fairly successful. , Albert D. Brokaw 



RiNNE, F. ''Baueritisierung, ein kristallographischer Abbau 

 dunkler Glimmer," Berichten d. math.-phys. Kl. kgl. sacks. 

 Gesell. d. Wiss., Leipzig, LXIII (1911), 441-45- 

 The author proposes the name Bauerite for bleached biotite, and 



Baueritization for the process of bleaching. A. J. 



ScHALLER, Waldemae. T. "Ncw Manganese Phosphates from the 

 Gem Tourmahne Field of Southern California," Jour. Wash. 

 Acad. Sci., II (191 2), i43-4S- 



ScHALLER, Waldemar T. Bcitrag zur Kenntnis der Turmalin- 

 gruppe. Inaug. Diss. Miinchen. Leipzig, 191 2. Pp. 343. 



Scrivenor, John Brooke. "The Gopeng Beds of Kinta (Feder- 

 ated Malay States)," Quar. Jour. Geol. Soc, London, No. 270, 

 Vol. LXVIII (191 2), 140-63. 

 In this interesting article the author gives a geologic and petrographic 

 description of the Gopeng beds, and advocates the theory that they were 

 formed as a result of glacial action. These beds, which are described as 

 resembling "drift composed of till and bowlder-clays," are found over- 

 lying strata of Carboniferous age and are considered older than an 

 associated Mesozoic granite. The Gopeng beds carry commercially 

 valuable deposits of tin which is found for the most part as disseminated 



