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MARYLAND GEOLOGICAL SURVEY 89
Geologic Section across the Piedmont Plateau in Maryland, "1 were
published during the year. A valuable paper by Mr. Keyes upon
" Paleozoic Fossils of Maryland " was also published in the University
Circulars. 2
Further contributions were made by Professor Williams during
this period upon the minerals of the state, and he also organized a
geological excursion of the students of the University for a study of
Appalachian geology, several days being spent in Allegany county
during the month of May, 1891.
In 1891 a plan of co-operation was arranged by Professor Clark
between the Johns Hopkins University, the Maryland Agricultural
College, and the United States Weather Bureau for a study of the
climatic conditions of the state of Maryland, and between May and
November of that year monthly meteorological reports were pub-
lished. The succeeding winter a bill was introduced into the General
Assembly of Maryland requesting the official recognition of the bureau
and the appropriation of $2000 annually for its maintenance. This
bill was passed in March, 1892, and received the signature of the
Governor upon April 7 of the same year. This co-operation with the
state has been maintained since that date, the headquarters of the
Service, in accordance with the provisions of the bill, being perma-
nently established at the Johns Hopkins University.
In February, 1892, the American Institute of Mining Engineers
held their annual meeting in Baltimore, and under the editorial direc-
tion of Dr. Williams there was prepared a " Guide to Baltimore, with
an Account of the Geology of its Environs and three Maps, " in which
the general distribution of the geological formations in the vicinity
of Baltimore is described. An important investigation3 conducted by
Dr. Williams during the early summer of 1892 was the determination
of many of the rocks of the South Mountain district in Maryland and
Pennsylvania to be of volcanic origin.
The importance of proper cartographic representation of the Balti-
1 Bull. Geol. Soc. Amer., vol. ii, 1891, pp. 319-322.
2 Johns Hopkins Univ. Circ. No. 94, vol. xi, 1891, pp. 28-29.
3 Amer. Jour. Sci., 3rd ser., vol. xliv, 1892, pp. 482-496.
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