106 27*e American Geologist, June, usw 
s. \\.. Prussia) I am requested to advise all the subscribers 
on the list of the American Committee who may still desire 
the geological map of Europe, to address the above publishing 
house directly, stating that they were subscribers on the 
American list in 1888, and are therefore entitled to receive the 
complete map for the sum of eighty marks." 
Dr. Fra/.er states that institutions and individuals may 
apply to him (1042 Drexel Building, Philadelphia) for those 
maps ordered for deceased subscribers, and that in this regard 
he will, other things being equal, give the preference to insti- 
tutions. 
Fifteenth Annual Report, U. S. Geological Survey. 
This report has just been delivered by the public printer. 
It is a handsome volume of 755 pages and 48 plates, and con- 
tains, besides the administrative reports of the director him- 
self and of chiefs in charge of work, the following special 
papers : 
'•Preliminary Report on the Geology of the Common Roads 
of the United States," by Prof. N. S. Shaler; "The Potomac 
Formation," by Prof. L. F. Ward; "Sketch of the Geology of 
the San Francisco Peninsula," by Andrew ( '. Lawson ; "Pre- 
liminary Report on the Marquette Iron-bearing District of 
Michigan," by Prof. C. R. Van Hise, W. S. Bayley and H. L. 
Smyth: and "The Origin and Relation of Central Maryland 
Granites," by Dr. ('. R. Keyes, with an "Introduction on the 
General Relations of the Granitic Rocks in the Middle Atlan- 
tic Piedmont Plateau," by the late Prof. G. H. Williams. 
From these titles it is evident that the paper of most popu- 
lar interest is the first one, on roads, by the versatile Harvard 
professor. He treats of the history of American roads, the 
methods of using stone in road-building, the relative value of 
road stones, their distribution, sources of supply, etc., and 
thus makes a timely contribution to a subject which is receiv- 
ing special attention in all parts of the country. 
This is the last report made by major J. W, Powell as di- 
rector of the Surve}^, who until recently has had charge of the 
work, under different organizations, for twenty-five years. 
New York Academy of Sciences. 
The section of geology and mineralogy held its regular 
meeting April 20th. President J. 4. Stevenson in the chair. 
The first paper of the evening was by Mi;. John D. Irving on "The 
Stratigraphy of the Brown's Park Bids. Utah." The observations on 
which the paper was based were made by Mr. Irving the past summer 
while spending a week in Brown's park, together with Dr. .1 L. Wort 
man and his expedition from the American Museum of Natural History, 
New York. Mr. Irving first sketched the topography and geology of 
the Green River basin and the Uinta mountains. He showed the loca 
tion of the Brown's Park beds and described their unconformable posi- 
tion upon the Uinta sandstone and the Green River shales. He next 
