466 Scientific Intelligence. 



Daemonelix. The rhizomes of the gigantic corkscrew were 

 found to be either simple or several times branched ; some of 

 them ended in an enlargement, but none of them showed small 

 Daemonelix spirals emerging from them, as has been stated by 

 other authors. The skeletons within Daemonelix are usually- 

 scattered "and quite often only the head is found crowded close 

 to the wall, or inside of the rim of the compact mass of roots." 

 The best skeleton was found near the end of one of the rhizomes. 

 Some of the latter attained a length of fifteen feet. 



In regard to the plant material found within the spirals, Mr. O. 

 E. Jennings states : " The vegetable tissues are apparently sim- 

 ply the remains of a mesh of roots such as is sometimes found 

 clogging a tile drain or sewer. . . . Enough was evident, how- 

 ever, to plainly indicate that nearly all the roots were those of 

 angiosperms, the cells discerned being quite typical." 



The evidence thus far presented is decidedly more in favor of 

 Daemonelix being the cast of fossorial rodent burrows than the 

 roots of some gigantic aquatic plant. c. s. 



6. Economic Geology of the Bingham Mining District, Utah; 

 by John Mason Boutwell ; with A Section on Areal Geology, 

 by Arthur Keith and An Introduction on General Geology, by 

 Samuel Franklin Emmons. U. S. G. S. Professional Paper, 

 No. 38, 396 pp., 49 pis., 10 figs, in text. — This paper, which 

 almost approaches a monograph in size and scope, is a valuable 

 contribution to the literature of economic geology as well as 

 being a detailed description of an important and interesting min- 

 ing district. Bingham has been a producing camp since about 

 1870. In the early days of the district the lead-silver deposits 

 were worked, the carbonate ores being first mined and then later 

 the sulphides. Some gold mining has also been carried on, both 

 placer and vein deposits. In 1896 large bodies of low-grade 

 copper ore were first seriously exploited and since then Bingham 

 has steadily risen in importance as a copper producer. The pro- 

 duction of copper from the district for the year 1902 was nearly 

 15,000,000 lbs. 



The Bingham district is situated on the east side of the Oquirrh 

 Mountains about fifteen miles south of Great Salt Lake. The 

 rocks of the section are made up chiefly of quartzites, sandstones 

 and limestones of Upper Carboniferous age, with intrusive bodies 

 of monzonite and monzonite porphyry and extrusive flows of 

 andesite. There is one broad open flexure of the rocks in the 

 district, a synclinal fold which pitches toward the northwest. 

 Besides this many smaller folds are found. The rocks are also 

 extensively faulted*. 



The ores occur in vein, bedded and disseminated deposits. The 

 vein deposits are chiefly those of argentiferous lead ore which fills 

 fissures that traverse all of the rock types. The bedded deposits 

 are of copper ore and are found in the limestones, while the dis- 

 seminated copper ore is restricted to the monzonitic intrus.ives. 



