478 Scientific Intelligence. 



exploited in the state. It is interesting to note that the most 

 prominent of these have been worked since early colonial days. 



Geological Map. — A geological map of Virginia, on a scale of 

 ] : 500,000, has recently been issued. Included on the same sheet 

 are five generalized columnar sections taken from the folios of 

 the U. S. Geological Survey. 



5. Jlexahi/drite, a Neio Mineral ; by A. A. Johnston. Sum- 

 mary Report, Geol. Sur. Branch of the Dept. of Mines, Canada, 

 256, 1911. — This mineral was found on the east bank of the Bona- 

 parte river, about half way between Cargill and Scottie creeks, in 

 the district of Lillooet, British Columbia. It occurs in the form 

 of seams varying in width up to one-half inch, also in scattered 

 patches in an altered schistose rock. In general the structure is 

 coarse-columnar but occasionally delicately fibrous ; a poor pris- 

 matic cleavage was observed. The mineral has a pearly luster 

 with a greenish white color. Before the blowpipe it intumes'ces 

 but does not fuse. In the closed tube it gives a large amount of 

 neutral water. It has a bitter, saline taste and is readily soluble 

 in water. In solution it gives tests for magnesium and sulphuric 

 acid. Sp. gr. = 1-757. The formula derived from the following 

 analysis is MgS0 4 .6H„0. The name of the mineral was derived 

 from the six molecules of water which it contains. In column I 

 the results of the analysis are given, in column II the same recal- 

 culated omitting the silica as an impurity, and in column III the 

 theoretical percentages for MgS0 4 .6H 2 0. The mineral epsomite 

 has the formula MgSOv7PI 2 0. 



I II III 



S0 3 34-52 35-19 35-09 



MgO 17-15 17-48 16-54 



H. 2 46-42 47-33 47'37 



Si0 2 (insol.) 1-78 ..... 



99-87 100-00 100-00 



W. E. F. 



III. Miscellaneous Scientific Intelligence. 



1. A Study of Chiriquian Antiquities • by George Grant 

 MacCurdy, Ph.D. Pp. i-xx, 1-249 ; pis. I-XLIX, figs. 384 

 Memoirs of the Connecticut Academy of Sciences. Vol. Ill, 

 March, 1911. New Haven, Conn. (Yale University Press.) — 

 It is fortunate for the science of archeology that the men and the 

 means have been found to produce in such excellent style the 

 work on Chiriquian antiquities to which Dr. MacCurdy has 

 devoted himself for so many years. It also speaks volumes for 

 the feeling of reciprocity existing among the patrons of archeol- 

 ogy, the museums, and the students of this day, that Dr. Mac- 

 Curdy has had free access to the numerous collections from the 

 Chiriquian area, and on account of these facilities in examining 

 great series of material, the work has the scope, knowledge and 

 adequacy which are its chief characteristic. 



