192 PETROLOGICAL ABSTRACTS AND REVIEWS 



pinkish red. The rocks have been used for building purposes, monu- 

 ments, bridges, curbing, paving blocks, and road metal; the amount of 

 production in the last ten years averaging $500,000 a year. 



A. J. 



Dale, T. Nelson. Supplementary Notes on the Commercial 

 Granites of Massachusetts. Bull. 470-G, U.S.G.S., 1911. 

 Pp. 6-56. 

 Supplementary to Bulletin 354, previously reviewed. 



Dale, T. Nelson. The Commercial Marbles of Western Vermont. 

 Bull. 521, U.S.G.S., 1912. Pp. 170, pi. 17, figs. 25. 

 In this bulletin. Professor Dale has described the western Vermont 

 marbles in much the same manner as he did the granites in a number of 

 earlier bulletins. After a preliminary description of marbles in general, 

 covering 60 pages and including a 6-page bibliography, the various 

 marble quarries of the area under consideration are described in detail. 

 Professor Dale's bulletins on the building and ornamental stones are 

 greatly appreciated, and it is to be hoped that he will continue issuing 

 them. Similar bulletins from other parts of the country would be of 

 considerable value. A. J. 



