PUBLICATIONS. Bits 
cussed in full, and the volume is accompanied with ten maps, one 
showing the general distribution of coal in the state and the other 
nine showing its distribution over local areas. These maps outline the 
course of the outcrops of the coal and the probable area underlaid by 
different seams, so that they will be of very great value to all those 
interested in the present or prospective development of coal fields. 
Probably no one feature developed by the Ohio Survey in its many 
years of existence will be of more economic value than these maps. 
The important oil and gas resources of the state are not treated in 
full, but are briefly discussed in the preface. The most important 
recent developments in the oil industry are the increased number of 
discoveries in the Trenton limestone, and the increased production 
from that source. This formation is now the leading source of illumi- 
nating oil in the United States. 
The supply of natural gas has greatiy decreased in the last few 
years. In 1890 Professor Orton made the prediction that unless the 
reckless waste of gas was restrained, the supply would soon be 
exhausted. At that time the use of gas was at its height and was 
adding immensely to the welfare of the state, not only in supplying a 
cheap, clean and convenient fuel to the people of the state, but in 
attracting new manufacturing industries. ‘The predictions of Professor 
Orton, therefore, were criticised as entirely unwarranted; but recent 
developments have verified the justice of his warnings. Most of the 
gas wells show signs of diminished capacity ; many have been com- 
pletely exhausted, and various industries started, or for some years 
run on gas, have now had to resort to coal. 
The chapter on the Archeology of Ohio is by Mr. Gerard Fowke of 
the Ethnological Bureau of the Smithsonian Institution. It treats the | 
subject in much detail, under the headings of Paleozoic Man; Enclos- 
ures, Roadways and Mounds ; The Mound Builders ; Indians ; Relics. 
The chapter on botany, by Professor W. A. Kellerman and W. C. 
Werner, is a complete list of Ohio plants. It combines not only the 
information given in previous lists, but also many new determinations, 
making it much more complete than any other previously published 
and of especial value to those interested in Ohio botany. 
Professor Orton states in the preface of the volume that it is the 
last official publication of the kind that he expects to prepare. This 
news will be received with much regret by all geologists, and especially 
by those who have watched Professor Orton’s excellent work carried 
