GEOLOGICAL SURVEY OF OHIO. LE 
out any complete or systematic treatise on the stratigraphy of the Ohio: 
formations. “To do so would require a number of persons employed all. 
of the time, instead of one for two or three months per year, and would 
require several years under these conditions. Professor Prosser will: 
present the results of his studies from time to time in Bulletin form. 
Each will be complete in itself and will attempt to settle definitely up 
to the present stage of knowledge the age and order of the formations 
discussed and the areas covered. It is the intention to continue, as means. 
are available, to spend modest sums annually on this work as long as may 
be needed, publishing Bulletins from time to time when they are ready.. 
SECOND. THE OCCURRENCE AND EXPLOITATION OF PETROLEUM AND 
NATURAL GAS. 3 
This topic has been previously carefully studied by the survey and’ 
elaborate reports were issued upon it in 1886, 1888 and 1890, presenting 
the facts then known. During the next ten years the industry continued 
to make rapid progress in extent and value of output. No further inves- 
tigations were authorized until 1900, when the legislature again made 
appropriations for the work of the Geological Survey. This topic was 
considered as among the most urgent of all those presenting themselves 
for attention, and it was at once determined to bring the records of the 
discoveries and production of oil and gas down to date, while the facts. 
were still available. 
Accordingly, in June, 1900, I appointed Professor John Adams Bow- 
nocker, of the Ohio State University, to take up the study of this subject,. 
and he pursued the same with great energy during the next three 
years. I submit the results of his labors with confidence that they will 
not only be found of great economic and scientific value at present, but 
also that their value will become increasingly apparent as time goes on. 
There seems good ground for believing that the supply of oil and gas is. 
short-lived. It was discovered but a few decades ago, yet we have already 
witnessed the rapid exhaustion of many important fields. It becomes 
doubly important, therefore, that we shall preserve while we can the most 
complete and detailed records of its discovery and use. It is believed that 
the present report, in connection with those before issued, will accomplish. 
these ends with credit to the state. 
THIRD. THE USES OF HYDRAULIC CEMENT. 
This topic, and the one following in item 4, represent most fairly the 
dominant idea which actuates the present management of the survey. 
The limestones, the lime industry, and the cement industry have all been 
written upon in the earlier reports. But, the point of view has so wholly 
changed, during the fifteen or twenty years since elapsed, that they fail 
to point out to the people of the state the value of their resources or the- 
