REVIEWS 
The Ann Arbor (Michigan) Folio, By FRANK LEVERETT, 15 folio 
pages of text and 3 maps. U.S. Geol. Surv., 1908. Geologische 
Streifztige in Heidelbergs Umgebung. Von Dr, Julius Ruska, 
Eine Einfiihrung in die Hauptfragen der Geologie auf Grund der 
Bildungsgeschichte des oberrheinischen Gebirgssystems, Pp, xi 
and 208 with numerous original views, maps, and sections, 
Nagele, Leipzig, 1908. 
How often has the university professor felt the need of a convenient 
printed discussion of essentially local geological problems to which he can 
refer the student—something not too brief er so diluted as to distort the 
facts, but an.adequate and readable presentation which the earnest student 
may turn to as a guide. In America this want has in a few instances been 
met by the geological folio of the university district, and whatever may be 
said of this form of publication with its endless duplications as applied 
wholesale throughout the country, it cannot be denied that as an aid to 
geological instruction at universities through description of the local geology 
it meets a real need. 
The Ann Arbor folio and the German booklet referred to above are 
alike successful efforts in the direction indicated; the one for a great Ameri- 
can university, the other for the oldest German university and the one 
which many American geologists claim as a second alma mater. 
The American publication has the luxurious dress of its class, but suf- 
fers from its ungainly proportions, particularly when it is carried into the 
field. Its mechanical construction, while an aid to ready reference, detracts 
somewhat from the interest of perusal. Fortunately in this instance a 
most serious objection to the folio system—the patchwork truncation of the 
area by the accidents of quadrangle limits—is not serious, since Ann Arbor 
falls almost exactly in the center of the sheet. 
The geological interest in the area is very largely restricted to the glacial 
and post-glacial history, and the significant distribution of the drift deposits 
with their modification in lake shores, has here been treated by one of our 
best authorities in that field. The whole subject of post-Wisconsin lake 
history, as applied to the Michigan area, is here for the first time compre- 
hensively treated in an easily accessible publication. Excellent original 
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