246 Scientific Intelligence. 



(6.) This is of the same type as (3). It is a finely laminated 

 building stone, but crystalline instead of granular. The speci- 

 men analyzed by Miss Herrinton is from the large quarries at 

 Lime City, Iowa. It is nearly a dolomite in composition. 



CaC0 3 _ 55 3 per cent 



MgC0 3 ._ 43-0 



Fe 2 3 and A1 2 3 .._ 1-4 



SiO„ 0-6 



100*3 



(7.) This is also a representative of the Gower limestone and of 

 the Le Claire lithological phase. The specimen was taken from 

 a ledge on Rock Creek, two and a half miles southwest of Tipton, 

 Iowa. The ledge is notable for its exceptionally high dip, reach- 

 ing 70°. It varies but little from true dolomite. The analysis 

 was made by G. R. Greaves. 



CaC0 3 55-76 per cent 



MgC0 3 ._ 43-85 



Fe 2 3 and A1 2 3 0-26 



SiO„ _... -. 0-12 



99-99 



Each of the seven specimens examined is nearly pure calcium 

 and magnesium carbonates. The admixtures of iron, alumina and 

 silica are quite insignificant. 



9. Minerals of Ontario. — Professor Willet G. Miller, of Kings- 

 ton, has recently published in the Ninth Report of the Bureau of 

 Mines, Ontario (pp. 192-212), a list of the minerals found in the 

 Province of Ontario, with notes in regard to their occurrence and 

 characters. This paper is accompanied by a large map of the 

 mining district of Sudbury, with the location of the nickel 

 deposits noted upon it. This gives an interesting representation 

 of the mineral wealth of this region. As is well '.known, the ore 

 is chiefly pyrrhotite, carrying some nickel. The average of sev- 

 eral analyses for each of the five townships in the Sudbury dis- 

 trict gives amounts varying from 1*94 to 2*99 p. c. Pentlandite 

 and nickeliferous pyrite also occur in the region. 



10. A Text-booh of Important Minerals and Hocks, with tables 

 on the determination of minerals / by S. E. Tillman. Pp. 176, 

 8vo, New York, 1900 (John Wiley & Sons). — This concise pre- 

 sentation of the principal facts of mineralogy, with brief accounts 

 of the important species, will be found useful by teachers who do 

 not want a more extended work. Some forty pages are devoted 

 to determinative tables, and the closing part of the volume deals 

 with common rocks of different types. 



11. Los Miner ales. — Su Descripcion y Analisis con especialidad 

 de los existentes en la Republica Argentina, por el Dr. Guillermo 

 Bodenbender. Pp. 306. Cordoba ; 1899. — Dr. Bodenbender 



