Review ot Recent Geological Literature. 261 
the sub-recent, having become extinct perhaps not more than five 
thousand years ago. 
As to man and the elephants, these data give no direct testi- 
mony that they were cotemporary, except in one instance. Mr. M. 
T. Myers, of Fort Madison, reports the finding of "one human leg 
bone and one flint arrow head" associated with the remains of the 
mammoth in the alluvium of Lee county, Iowa. This is in the 
region where so-called "elephant pipes" have been claimed to occur 
in mounde constructed by earlier inhabitants of the country. "At 
all events the evident recency of some of the proboscidean remains 
makes us expectant of some fortunate discovery giving conclusive 
proof that man lived on this continent while these huge mammals 
were yet here." n. h w. 
Indiana Department of Geology and Natural Resources. 29th Annual 
Report. W. S Blatchley, State Geologist, pp. 1-888; pi., 34; 
figs., 67: maps, 7; Indianapolis, 1905. 
In the introduction to this report Prof. Blatchley reviews the 
development of the natural resources of the state during the past 
ten years. During 1895 the total output of coal, oil, gas, building 
stone, clay-products and Portland cement was $16,770,816, while in 
1904 the total output of these same products was $36,028,755, or an 
increase of 115 per cent. 
The body of the book is made up of an article on "The Clays 
and Clay Industries of Indiana" by W. S. Blatchley. In the open- 
ing chapter he treats of the technology of clay. The geological 
distribution of Indiana clays forms the subject of the second chap- 
ter which is followed by "The Clays of Indiana by Counties'-' in 
which the clays within five miles of transportation lines are taken 
up and discussed in detail. Analyses are given and suggestions 
made as to the possible utility of individual deposits. These are 
frequently accompanied by maps and halftones of the exposures. 
In the fourth chapter, the clay working industries of Indiana, he 
discusses the growth of the clay-working industries of the state 
from $3,85S.350 in 1900, to $6,085,242 in 1904, and gives in detail the 
methods and processes of manufacture, tests and uses of the pro- 
ducts made from Indiana clays. These include paving material, 
sewer pipe and hollow wares, refractory products, pottery and 
allied products, dry pressed brick, structural terra cotta, building 
brick and tile and the production of clay for shipment. This article 
is calculated to be a practical aid to the development of the clay 
resources of the state and, while a larger number of maps would 
have added to its value, yet, it serves that end admirably. It is 
intended largely for the use of the layman and is couched in the 
clear simple language characteristic of the author. 
The remaining quarter of the book contains five articles, the 
first of which is the report of the mine inspector, James Epperson. 
This shows the total output of coal for 1904 to be 9,872,404 tons 
against 9,992,553 tons for 1903. The next article is the report of 
