Personfil and Scienti^flr Xevs. 329 
The Council of the Geological Society of America has 
determined that the eighth winter meeting of the Societj' shall 
be held in Philadelphia, beginning on the afternoon of Thurs- 
day, December 26th. 1895. More detailed information regard- 
ing the meeting will be sent to fellows in due time. 
M. Charles Bouchard has lately announced that he has 
examined spectroscopically the gases from tlu-ee sulphurous 
springs in the Pyrenees and that in one he found the charac- 
teristic lines of both argon and helium, in one'of helium alone 
and in a third helium and an unknown substance character- 
ized by lines in the orange and red. 
•'Tables for the Determination of Minerals by jjhj'sical 
properties ascertainable with the aid of a few field instruments, 
based on the sj'^stem of Prof. Dr. Albin Weisbach, by Persifor 
Frazer, Docteur es-Sciences, etc., etc. J. B. Lippincott Co." 
This book, printed first in 1874 and of which three editions 
have already ])een exhausted, is undergoing a thorough over- 
hauling for a fourth edition which will appear shortly and 
which will be reviewed in this journal then. 
Dr. Gerhard Holm's article, "Om Didymograptus, Tetra- 
graptus och Phyllograptus," which appeared in Geologiska 
Forenigens i Stockholm Forhandlingar (Bd. 1.7, Hafte 3, No. 
164, pp. 319-359, 1895,) and was reviewed in the American 
Geologist (vol. 16, pp. 58-59, July, 1895), has been translated 
into English by Messrs. G. L. Elles and E. M. R. Wood and 
is being published in the Geological Magazine. The first part 
appeared in the October number of that journal. 
Mr. C. p. Berkey, instructor in mineralogy in the Univer- 
sity of Minnesota, is at work on a detailed geological and to- 
pographical map of a district along the St. Croix river on the 
boundary between Wisconsin and Minnesota. Here occurs 
the well known unconformity between the igneous rocks of the 
Keweenawan and the overlying strata of the Upper Cambrian. 
Mr. Berkey expects especially to make a chemical investiga- 
tion of the diabases at this point, with reference to alteration 
products. 
The Brooklyn Institute of Arts and Sciences has issued a 
prospectus for 1895-'96 which gives ])reliniinary announce- 
ments of lectures, courses of instruction, etc., for the year. 
Lectures are announced in geology, for the first Monday even- 
ing in each month, by Messrs. T. C. Mendenhall, R. S. Wood- 
ward, C. D. Walcott,'j. F. James, C. S. Prosser, W J McGee, 
W. M. Davis and D. S. Martin. In the mineralogical depart- 
ment the following gentlemen will lecture: Messrs. AV. O. 
Crosby, S. L. Penfield, W J McCJee and A J. Moses. 
Dr. Persifor Frazer, who obtained the one hundred sub- 
scribers which were required in order to secure the geologi- 
cal map of Europe of the International Geological Congress 
