Review of Recent Geological Literature. 259 
what one should expect, when its price is taken into consideration. In 
Dr. Farrington's book we have an authoritative work within reach of 
the average book-buyer, and that is, in itself, sufficient excuse for its 
existence. G. p. m. 
An attciiil^t to classify Palaeozoic Batrachian Footprints; by G. F 
MATTHiiW, LL.D. [Trans. Roy. Soc. Can., Ser. 2, vol. IX, Sec. IV, 
p. 109.] New genera of Batrachian Footprints of the Carboniferous 
System in Eastern Cranada; by the same author. [Can. Rec. Sci., 
vol IX. No. 2, p. 99, 1903-] 
These two articles by Dr. Matthew are based chiefly on material in 
the Peter Redpath Museum of McGill University, the greater part of 
which had been obtained by the late Sir W. J. Dawson. The author re- 
marks upon the broad use of generic names by various writers who 
have described the footprints of vertebrates on layers of the Carbon- 
iferous rocks of America, and attempts to classify them under some of 
the generic names that have been used. 
• A table is given showing the classification of these tracks, based on 
the number of toe-marks, and on their form. The impression made 
by tne tail (or belly) is not found to be of value for generic separation, 
as closely allied forms may or may not exhibit such a mark. In the 
first article three plates of figures are given to show the types of the 
more important genera that have been described, chiefly by King, Lea, 
Butts, Marsh, Leidy, and Dawson. 
In the second article are described := number of new genera, based 
chiefly on the material in the Redpath Museum. Most of these are 
small species that were found among the material that Sir William 
Dawson had collected at the Joggins shore in Nova Scotia from the 
Coal Measures that outcrop there. Two of the genera are based on 
larger forms that were sent to Sir William from other parts of Nova 
Scotia, and differ generically from any described forms. 
The variet}^ in these footmarks indicates animals of very diverse 
structure, and some from the Joggins may have belonged to g-enera of 
Microsaura from that locality, which Sir William has described in his 
"Airbreathers of the Coal Period." A plate of figures of the new genera 
accompanies the article. 
Harriman Alaska Expedition, Volume HI: Glaciers and Glaciation. By 
Grove K.\rl Gilbert. Pages xii, 231 ; with 18 plates, and 106 figures 
in the text. New York : Doubleday, Page & Co., 1504. 
The observations of Mr. Gilbert and others in this expedition in 1899, 
voyaging along all the southern coast of Alaska to Unalaska and Bogo- 
slof islands, and thence northward to Plover bay on the Siberian coast, 
to the vicinity of Cape Prince of Wales, and to St. Lawrence island, 
are well narrated in this volume, with very ample illustrations from 
photographs of the glaciers and of the topographic features. The scope 
of the work is confined chiefly to these observations and the discussion 
of their significance as to the action of glaciers, past and present, with- 
