496 Scientific Intelligence. 
of 60 elements gave 3°6 volts with an internal resistance of 0°65 
ohms. The amount of gas consumed by both models was 180 
liters per hour. 
II. GEoLogy AND MINERALOGY. 
_ 1. International Geological Congress.—The third session of the 
International Geological Congress will be opened at Berlin on the 
28th of September, under the honorary presidency of Dr. H. von 
Dechen, and will continue to October 3d. Geological excursions 
Those intend- 
2. Pennsylvania Geological Atlas of Counties. — Professor 
Lesley, the Director of the Geological Survey of Pennsylvania, 
has published, in octavo form, an atlas of County geological maps, 
sixty-seven in number and admirable in all respects, together with 
introductory text containing a general account of the several 
counties both topographical and geological. It is exceedingly 
incomplete sentences in his article upon massive safflorite, on Pp. 
370 of the May number, should read as follows: “He further 
appears to doubt the accuracy of the statement which appears 5° 
¢ 1.” The interpolations requisite for a proper understand- 
ing are in italics. 
reconstituted rocks, I was completely deceived regarding its 
nature and relations to the meteoric mass. 
