

SiO„ 



A1 2 3 



Fe„0 3 



I 



39-97 



8-68 



8-63 



II 



36-24 



905 



10-64 





co„ 



TiO„ 



p.A 



I 



1-15 



4-05* 



o-io 



II 





7-12 



o-oi 



Na.,0 



K o 



1-19 



0-74 



1-05 



0-43 



H 2 



Total 



0-57 = 



99-77 



0-65 = 



99-75 



70 Scientific Intelligence. 



of the mass is such that the most feldspathic variety, akerite, is 

 on the periphery while the most basic, the yamaskite, is at the 

 center. 



The yamaskite, which is a new rock type, has the same general 

 chemical composition as the jacupirangite of Derby and Wash- 

 ington but differs quite decidedly in its mineralogical composi- 

 tion. It consists of pyroxene, pink and pleochroic in section, 

 basaltic brown hornblende, anorthite and ilmenite as the chief 

 minerals. It is far more basic than essexite, as may be seen from 

 the two analyses quoted : 



FeO MgO CaO 



7-99 10-32 15-18 



9-58 7-75 14-97 



FeS, MnO 



1-01 0-19 



097 0-29 



It is noteworthy that No. II, which is an extremely basic rock, 

 has more anorthite than No. I, containing about 15 per cent. 

 The rock has a coarse, even granular texture. Its coordinates in 

 the new quantitative classification are IV; 2, Sec. 1 ; I, Sec. 2 ; 

 2, which is termed yamaskose, as it is a hitherto undescribed 

 sub-rang. 



The work represents a thesis prepared as a part of the require- 

 ments for the attainment of the degree of doctor of philosophy 

 in Yale University. l. v. p. 



8. Geology of the Volcanic Area of the East Moreton and 

 Wide Bay Districts, Queensland, Australia ; by H. I Jensen, 



Proc. Linn. Soc. New South Wales, 1906, Pt. 1, pp. 73-173. — 

 This account of the geology of two districts in Queensland is of 

 more than local value on account of the interesting types of rare 

 volcanic rocks which are described. These are alkalic trachytes 

 and allied rocks, comendites and pantellarites. They contain 

 blue amphiboles (riebeckite and arfvedsonite) and cossyrite 

 (aenigmatite). They are somewhat briefly described and a num- 

 ber of excellent analyses of them are given. The work shows 

 clearly the existence of a province of alkalic rocks in the region 

 described, whose complete petrographic investigation would 

 undoubtedly yield results of great interest and value. l. v. p. 



9. The Building and Ornamented Stones of North Carolina; 

 by Thomas L. Watson and Francis B. Lanev, with the collab- 

 oration of George P. Merrill. Pp. xiii, 283, with 32 plates 

 and 11 figures. Raleigh, 1906 (E. M. Uzzell). Bulletin No. 2 

 of the North Carolina Geological Survey : Joseph Hyde Pratt, 

 State Geologist. — The State of North Carolina is well supplied 

 with a great variety of building stones, particularly those of the 

 granitic t} 7 pe ; with the possible exception of Georgia, it ranks 

 higher in this field than any of the other Appalachian States south 

 of New England. This fact, taken in connection with the mildness 

 of the climate and the cheapness of labor, should result in the 



