Reviews—Maryland; Iowa; Alabama. 073 
iron ores, and ice-borne boulders.’”’ The Plocene deposits have 
yielded no fossils; on the other hand, those of Pleistocene age have 
yielded a diversified fauna and flora. The Mammalia are described 
by F. A. Lucas, the Reptilia by O. P. Hay, the Insecta by E. H. 
Sellards, the Crustacea, Mollusca, Coelenterata, and Protozoa by 
W. B. Clark (State Geologist), the Molluscoidea by E. O. Ulrich, and 
the Plants by Arthur Hollick. 
The volume is copiously illustrated with maps and diagram-sections, 
with photographic plates of scenery and geological phenomena, and 
figures of the organic remains. One plate gives a restoration of the 
American Mastodon, Mammut americanum (Kurr). 
2.— Reporr on vee PauysicAn Fuarcres or Manryranp. By 
Wm. Bourtock Crank and Epwarp B. Maruuws. pp. xv, 284, 
30 plates, 19 text-figures, and geological map of Maryland. 
(Baltimore, 1906.) 
This is in reality a handbook to the country, embracing an account 
of the physiography, geology, mineral resources, agriculture, climate, 
hydrography, terrestrial magnetism, and forestry. It summarises the 
information acquired, and “will help to make popular the results 
of the Geological Survey. Among the illustrations are plates of 
characteristic fossils from Silurian to Pleistocene. The well-printed 
geological map shows clearly the various formations, and to the 
description of these are appended notes on the characters of the soils 
and the crops they yield. 
VII.—Iowa Gronocicat Survey. 
i JE have lately received the sixteenth volume of the publications 
of this Survey, including the Annual Report for 1905 and 
accompanying papers dated 1906. Under the direction of Dr. Frank A. 
Wilder, State Geologist, special attention has been given to economic 
geology; and he remarks: ‘‘ There is a large and steadily increasing 
demand on the Survey made by residents of the State for assistance in 
investigating problems and examining specimens which seem to have 
economic significance. I have no doubt that in this the Survey at 
this stage in its development will render its greatest returns to the 
State, and the Director and his assistants have not hesitated to give 
freely of their time in answering appeals for examinations of mineral 
localities,” 
Reports on the geology of eight counties are included, together with 
statistics of the mineral production in Iowa for 1905. There was an 
increase in the production of coal, gypsum, and sand-lime brick. 
VIII.—Atasama GronogicaL SURVEY. 
N instructive report on ‘‘The Underground Water Resources of 
3 Alabama,’’ by Mr. Eugene Allen Smith, has been published. 
As usual, there are introductory chapters on the physical geography, 
geology, ‘and climate, and on the general principles of underground 
waters and artesian wells. These are followed by detailed descrip- 
tious of the wells, springs, and meiner are of the country. 
