228 Scientific Intelligence. 
will prove itself equal to the task it has set ~~ to perform, and 
add fresh laurels to those it has earned in the 
8. Etudes pratique sur les Marées fluviales : notamment § sur 
le gVpeatesd application aux oe de la Partie maritime des- 
Fleuves, par M. Comoy. 389 pp., large 8vo, with an atlas of ten 
plates. Paris: 1881 (Gauthier Villans: New York, F. W. Chris- 
tem). i . Comoy is a valuable contribution to a. 
difficult and complex, and at the same time, highly interesting 
fr 
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subject. he author approaches it from ‘the practical side, 
ugh the results of numerous personal observations and - ub- : 
lished records rather than by means of mathematical analysis. ; 
e opening chapters contain a simple discussion of waves 0 a 
considered, and then the more difficult subject of tidal waves in 
rivers—all in a clear and satisfactory manner. The chief interest 
of the volume centers in the discussion of the Mascaret, a phenom- 
enon to the study of which the author has devoted mu uch time and 4 
Prororoca in the Amazon the Barre on the Seine. It is @ 
capricious a non On some rivers of a reach varying 
much in its sometimes almost disappearing and again . — 
regaining its orga fotaneice, The author discusses this portion A 
of his subject with much t i ohoagheiats, going over the views of 
others as to the cause of the phenomenon and then developing 
facilitate navigation. In the final chapter he give a detailed 
study of the prineipal rivers of France in their santos to the 
es. 
II. GEoLoGy anp MINERALOGY. 
soe’ ak on the A erminal Moraine of the Second 
Glicial Epoch; by T. C. Coamperiin. 110 pp. 4to, with maps 
and plates. ees the - Pac Rep. of the Director of the U.S. 
eee eo rete ay 1-82.—This important paper Professor 
peer) se at page 68 of the last a bk of this 
Fo a “te pe cio es with a statement of general principles 
with regard to the drift, and a description of the materials, their 
kinds, arrangement and distribution, and then gives details with 
regard to the eeueare: forms and geo Bia ag arrangement of 
the “ Terminal Moraine of the Second Glacial Epoch.” 
The relation as to position between this second revista moraine 
and the southern limit of the “ drift-bearing area,” or the extreme 
limit of proper glacial transportation, is well presented on the 
