10 REPORT 
Of these persons, Professors Prosser and Bownocker have been in 
continuous service since the survey was organized and have been at all. 
times consulted in the policy of its management. All others have been in 
temporary connection only and have been consulted only regarding their: 
own special tasks. In the cases of Messrs. Mumma, Nauss, Eisenlohr, 
Somermeir, and Hyde, the terms of employment have been short and the 
responsibility small. In the cases of Messrs. Eno, Bleininger, and Peppel,. 
Miss Derby and Mrs. Prosser, each has prepared a bulletin or a portion. 
- Of one, over his or her own signature. Prof. N. W. Lord has work in: 
process of preparation. 
INVESTIGATIONS COMPLETED AND IN PROGRESS. 
FIRST. THE AREAL AND STRATIGRAPHICAL GEOLOGY OF OHIO. 
The elaborate work done upon this topic in the seventies, and pub-. 
lished in Volumes I, II and III, of the Survey Reports, was excellent at 
the time, but now needs revision. The work from 1882 to 1894 being 
economic, stratigraphical questions were only studied so far as necessary 
to tracing and classifying mineral deposits, so that the strata of Ohio 
were not classified according to the now accepted schemes, nor correlated 
with those of surrounding states, except where economic work made prac-- 
tical correlation necessary. Geologists from the United State Geolog-. 
ical Survey, and from other states, were being sent into Ohio in order to* 
find what light the rocks of this state would shed upon mooted points. 
in stratigraphical work elsewhere. 
Considerations of state pride as well as scientific enthusiasm both 
urged that this state should carry its own burdens and do its share in: 
furthering researches into these purely scientific aspects of geology. 
Accordingly a small sum of money was set aside for this purpose and 
Mr. Charles S. Prosser, M. Sc., Professor of Geology in the Ohio State- 
University, was appointed Assistant Geologist in charge of this topic. 
Professor Prosser was unable to at ance begin on Ohio work, as he- 
had at the time unfinished researches in Kansas, Maryland and New 
York to complete and report upon for the United States Geological Sur-- 
vey or state surveys. But a beginning was made in 1900, and as these- 
other tasks have from time to time been concluded, an increasing share 
of his time has been devoted to Ohio work, until it now receiyes almost 
the entire time he has available from University duties. 
Professor Prosser has made a considerable headway in certain parts. 
of the state. His first, Bulletin No. 7, on the Revised Nomenclature of 
the Ohio Geological Formations, appeared in December, 1905, and will. 
take its place in Volume IX of this series. 
In the nature of the case, Professor Prosser, working in the field 
during the summer vacation only, cannot expect or be expected to bring: 
