REVIEWS 773 
the beginning of the latter period, as indicated by the glacial beds in 
New South Wales and other parts of Australia, has been suggested as 
the cause of the marked break between the two floras. 
Fresh-water formations characterize the Triassic and Jurassic, 
but a subsidence with an extensive marine transgression took place in 
Australia during the Cretaceous, somewhat as in the other continents. 
But in the Tertiary neither marine nor lacustrine deposits of any 
importance are known to occur; the geological formations fail to provide 
an adequate record of the history and much of what is known is inferred 
from the topographic features. The history ends tamely, for the Pleisto- 
cene glaciation in Australia was limited in extent. 
Because of the definiteness with which the subject-matter is handled, 
the book will be extremely useful to students in far-away countries who 
need the larger features and the bearing of the essential facts brought 
out clearly but concisely. A chapter is given to each geologic period 
and each chapter closes with a well-considered summary which empha- 
sizes the most significant features of that particular period. The 
treatment is judicious and philosophic. 
Rote: 
History of Geology. By Horace B. Woopwarp. New York: 
Putnam, torr. Pp. 204. 
This little volume is included in ‘“‘A History of the Sciences” series, 
and well accomplishes the purpose of printing a history of geology in 
small compass. On the whole the work has been well done, but the 
reader will sometimes be inclined to think that perspective has been 
lost through the prominence given to English geologists of the pre- 
observational period. The author’s judgment is not always unerring, 
as for example in the place accorded to the bombastic and imaginative 
De Luc. The effect of De Luc’s activity, as viewed from this distance, 
would seem to have been chiefly to stem the advance of independent 
thought by such men as Hutton and Playfair, and to lead the reactionary 
elements within the church. 
Wie Vel lel 
LOWER CRETACEOUS OF MARYLAND 
Under the simple title Lower Cretaceous, the State Geological Survey 
of Maryland issues what is in effect a monograph of the Lower Cretaceous 
formations of the state and their paleontology. For while the work 
consists mainly of the descriptions of all the fossils hitherto found in 
