114 The America}} GeoJof/isf. An-ust, is)r>. 
ing printed on th'.' base used for the geologic map compiled 
by the same author in 1884, and published in the Fifth An- 
nvial Report of the Survey ; this earlier map serving also as the 
basis of Professor Hitchcock's map of 1886, which was printed 
(by permission of director Powell) from the stones prepared 
for the survey edition, with certain alterations — notably the 
extension of reconnoissanee and hypothetic coloring over un- 
survejT-ed portions of the country. The present map, like its 
predecessor, omits coloring from Canada and Mexico, and from 
areas not yet surveyed geologically; but it ditfers from its 
predecessor in that the results of trustworthy reconnoissanee 
in the unsurveyed portions of the United States are intro- 
duced. In addition to the regular edition of this map accom- 
panying the Fourteenth Annual Report of the Survey, a lim- 
ited number of copies of the complete map and of a series of 
sheets each showing a single geologic system have been printed 
by director Walcott for the use of working geologists. A 
number of sets of majos, each comprising the geologic map, 
the base map with contours but without geologic colors, and 
a series of the system sheets, has been distributed by the Sur- 
vey in advance of the issue of the report." u. s. G. 
Beginning with this month's issue the American Geologist 
will be printed by the Franklin Printing Co., 50 Fourth St, S., 
Minneapolis. Mr. Nelson F. Twing, under whose careful over- 
sight this journal has been printed for the last five j-ears, is 
manager of this company. The rates for excerpts, found on 
the third page of the cover, have in some cases been slightly 
reduced. u. s. G. 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Evolution of Australia. By A. C. Gregory. At the recent meeting 
of the Australian Association for the Advancement of Science the pres- 
ident, the Hon. A. C. Gregory, C. M. G., chose for tTie subject of his 
address "The Geographical Development of the Australian Continent." 
Mr. Gregory's great experience as an explorer lent unusual interest and 
value to his statements. 
In very early times a chain of islands extended northward from Tas- 
mania to cape York, a distance of 2,000 miles, with a breadth of not 
more than one hundred. In western Australia a wide table land 
stretched from cape Leeuwin northward for 1,000 miles. Both were 
