120 T]ie American Geologist. February, 1900 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Kalencferfur Geologen, Palceontologen unci Miiieralogen, herausge- 
geben von Dr. K. Keilhack, of the German geological survey in Ber- 
lin. 3rd year, igoo. Leipzig, Max Weg. Price 3 marks. 
This is a pocket diary containing lists of addresses of geologists 
attached to surveys and educational institutions the world over, and 
is fairly complete for America. The list of European museums and 
their collections with the addresses makes the work a handy com- 
panion for a trip abroad. Several useful references, classifications and 
characters of minerals, rocks, etc., fill out the booklet to over 300 
printed pages. 
J. B. W. 
Traitc de Gcologie, par \.X)y^ Lapparent, professeur de I'Ecole 
libre de Hautes Etudes. 4th edition, revised and considerably enlarged. 
In 3 fascicules, part I, pages 1-5Q2, part II, 593-1240; part III. (in the 
press.) Masson & Cie, editeurs, Paris, 1900. Price (about) $6.00. 
The fourth edition of professor De Lapparent's well known treatise 
on geology easily ranks the author as the leading exponent of the 
French school of geologists. The work is written in an engaging, 
readable style. The subject matter is divided into two divisions, ac- 
tual causes or processes now in operation given in part first, and geol- 
ogy "properly so-called," which occupies the remainder of the work. 
Part first contains a description of existing changes produced by the 
various agencies recognized by the science, including a good account 
of changes of level. The work of rivers is not so fully exposed as one 
might expect from the author of the leading text-book on the "new 
geology" in Europe. 
Part second begins with a rather full synopsis of rocks, in which the 
ideas of Messrs. Levy and Fouque, Rosenbusch and other petrograph- 
ers are set forth. 
The most notable feature of the book is the treatment of the strati- 
graphic groups. Instead of throwing accent upon the greater divisions 
or systems, the author adopts the subdivisions as units of description 
and supplements the account with a valuable series of black-line 
sketch maps on Mercator's projection. While it is recognized that 
these maps must be necessarily in error for many parts of the globe, 
the author hopes that they will throw light on the ancient geography 
of our planet and stimulate geologists to correct such errors as exist. 
More special maps are furnished for Europe and France after the man- 
ner of Dana's maps for America. In this matter of world maps, the 
book is at present unique and cannot but prove a valuable aid to the 
student in all matters of geographic distribution in the past. Copious 
references at the foot of the page give the clue to original papers, thus 
serving the needs of the advanced student in palaeontology and 
geology. J. B. w. 
