Reviein of Recent Geological Literature. 57 
passed to the senate of the University of London and to all those 
who had assisted the Congress in its work, &c. Prof. Capel- 
lini in a few graceful phrases expressed the gratification of 
the foreign members and regretted the absence, owing to sick- 
ness, of Prof. Huxley. The President in accordance with a 
vote then passed declared the Congress adjourned. 
In the remaining part of his book Col. Delgado describes the 
collections both of the Congress itself and of the museums 
visited by its members, the excursions, &c., and concludes 
with a few words of faith in the utility of the Congress and 
appreciation for the labors of the English committee. 
REVIEW OF RECENT GEOLOGICAL LITERATURE. 
The rock-scorings of the gj-eat ice invasions. By T. C. Chamherlix. 
Pages 147-248. (Accompanying the seventh annual report of the 
director of the U. S. geological survey). Fifty figures, mostly repro- 
duced from photographs, are inserted in the text, illustrating various 
conditions in glacial erosion and striation, both of the bed rocks and 
of the boulders and pebbles in the drift. Very instructive and extraor- 
dinary glacial markings, supplying about a quarter part of these 
illustrations, are found on the Coruiferous limestone surface of Kelly's 
island in the west part of lake Erie. There the Stri;e in one place 
follow the winding channel of a water-course that is worn several feet 
deep in the rock ; and specimens of glacially fluted limestone are 
obtained which resemble the massive mouldings of architecture. 
Strict? have been recorded in about 2,500 localities upon the glaciated 
area of the United States, being in some disltricts too numerous for 
representation on the accompanying map ; while in other districts, 
some of whicli. as notably the Adirondack mountain group, doubtless 
have abundant glacial markings, no observations of them have been 
obtained. 
The geographical distribution and topographical relations of the 
strife, especially the varying positions of the striated surfaces, and the 
influence of topography as affecting the distribution of 8tri;v are con- 
sidered in much detail ; and the evidence points indubitably to the 
grinding and scoring action of a vast sheet of land-ice moving radially 
outward from central areas of maximum accumulation. Amplifying a 
simile of professor Newberry, the author remarks: "The glacialist 
should be able to distinguish with as much certainty the traces of a 
glacier or of an iceberg or ice-floe as the hunter the track of a bear or a 
moose or a serpent. A glacier may bo likened to an ophidian, crawl- 
ing prone ; an iceberg, to a digitigrade, walking on its toes ; an ice- 
floe, to a semiplantigrade, setting down the edge of its foot." 
Intersecting strise on the same rock surface, and adjacent surfaces 
