324: Scientific Intelligence. 



as 4172*122 and 4033-112 are probably identical with the gallium 

 lines above noted. The proportion of the element present is 

 probably small as compared with that of iron, the solar spectrum 

 being fairly imitated by the arc spectrum of blast furnace iron 

 containing one-thirty thousandth of its weight of gallium. 



II. Geology. 



1. Geology of the Boston Basin ; by William O. Ceosby. 

 Vol. I, Part III. The Blue Hills Complex. Boston Society of 

 Natural History. Occasional Papers IV"; pp. 289-894, 24 plates 

 and maps, 24 figures. — The Blue Hills Complex is an area of 

 granitic rocks and Cambrian strata which constitutes the highest 

 remnant of the New England peneplain to be found on the 

 Atlantic Coast line south of New Hampshire. The Cambrian 

 strata are calcareous slates and belong both to the Olenellus and 

 the Paradoxides zone. At some time not later than the Devonian 

 these Cambrian strata were invaded by igneous rocks. The 

 igneous types include granitic phases of one parent batholite ; 

 intrusive diabases, quartz porphyries and felsites; extrusive apo- 

 rhyolites. The theory ot formation of the Complex is given by 

 Prof. Crosby as follows : The magma from which the granitic 

 rocks were crystallized was produced by the fusion of the floor 

 upon which the Cambrian strata^ were originally deposited. 

 "This fusion, however, only extended up to a certain uneven sur- 

 face, which surface now constitutes the demarcation between the 

 granitic series and the Cambrian. Above this surface or upper 

 limit of fusion the Cambrian formations retained their stratiform 

 or bedded disposition and rested as a crust of hard and brittle 

 rocks upon the magma, subject to its metamorphic influences. 

 There is abundant evidence that while resting upon this plastic 

 magma the crust was violently disturbed, folded, crumpled and in 

 places shattered." The closing event in the development of the 

 hard rocks of the Blue Hills Complex was the making of an 

 extensive series of basic dikes. 



In addition to the study of the petrography and general 

 geology of the region (pp. 325-542), the surface geology has 

 been mapped and described by Prof. Crosby (pp. 542-564) and a 

 special paper is added by A. W. Grabau on " Lake Bouve," an 

 extinct glacial lake of large extent in the southern part of the 

 Boston basin. The last chapter in the book is also by Dr. 

 Grabau and deals with the paleontology of the Cambrian ter- 

 ranes of the Boston basin. The fossils are described in detail 

 and figured (pp. 614-694). Unfortunately the book has been 

 printed with no table of contents and no index. ii. e. g. 



2. The University Geological Survey of Kansas. Conducted 

 under authority of the Board of Regents of the University of 

 Kansas. Vol. VI. Paleontology. Part II. Carboniferous and 

 Cretaceous. S. W. Williston, Paleontologist. 1900. Pp. 1-516; 

 plates i-LXXin. — The following three papers are included in this 



