508 
PHILOSOPHICAL SOCIETY OP WASHINGTON. 
Mr. Robert T. Hill read a paper on The geologic evolution 
of the topography of Texas. This paper also was accompanied 
by lantern views. 
388th Meeting. April 23, 1892. 
President Gilbert in the chair. 
Twenty-five members and guests present. 
Announcement was made of the election to and qualification 
for membership of Henry Fitch Blount. 
The following circular of the Committee on Publications was 
then read: 
f 
Circular of the Committee on Publications of the Philosophical 
Society of Washington. 
The Committee on Publications of the Philosophical Society of Wash¬ 
ington beg to announce to the members of the Society the completion 
and distribution to members of volume XI of the Bulletin. This volume, 
containing xxxi-618 pages, has been printed and distributed to members 
in eighteen parts, at irregular intervals, of which the first was issued in 
February, 1889, and the last in April, 1892. 
Under authority from the General Committee, the Publication Com¬ 
mittee has made arrangements for binding this volume at the expense of 
the Society. The binding is to be in substantial cloth cover and uniform 
in style. The binding will be done by Messrs. Gibson Bros., 1238 Penn¬ 
sylvania avenue. Any member having a complete set of the eighteen 
parts constituting volume XI can have them bound in the style adopted 
by the committee free of charge. 
To enable those members who may have lost or destroyed some of the 
parts to complete their broken sets single copies of separates will be sold 
to such members at cost. 
The list of these separates and the rate at which one copy may be 
bought by each member is as follows : 
Philosophy and specialties, by Garrick Mallery. 39 pp., $0 15 
On the observation of sudden phenomena, by S. P. Langley. 10 “ 05 
On some of the greater problems of physical geology, by 
C. E. Dutton... 14 “ 05 
On the crystallization of igneous rocks, by J. P. Iddings.. 49 “ 20 
On the reduction of pendulum observations, by E. D. 
Preston. .. 16 “ 10 
