1893.] Mineralogy and Petrography. 387 
Microchemical Reactions.—The methods of testing for traces 
of ammonia under the microscope, and ri prempteres metals with 
HS are described in a few words by Stre 
Directions for the detection of the ERA minerals in small par- 
ticles are given by Lemberg:” Scapolite, hauyne, sodalite, eudialite, 
lazurite, sulphur, okoia celestite and melilite. 
Mincellasiwedea- iai the title “Rapid Qualitative Examina- 
tion of Mineral Substances,” Moses and Wells” publish a scheme for 
the detection of minerals. The blowpipe method is used with the 
metallic minerals, but in the silicate group a mixture of the dry and 
wet methods is made use of. From a hasty reading of the scheme it 
seems to be a practicable and convenient one. 
Neues. Jahrb., 1893, I, p. 49. 
*Zeits. d. deutsch. geol. Ges., 1892, p. 224. 
School of Mines Quart., Nov., 1892, p. 25. 
