940 The American Naturalist. [November, 
The first division embraces the central mountainous parts, and con- 
tains Laurentian, Taconic, Cambrian, and Siluric rocks, also Devo- 
nic rocks unconformable to the last. The second division, parallel to 
that just named, and extending to within a hundred miles of the Car- 
ibbean Sea, contains sediments of Carboniferous, Permian, and Meso- 
zoic ages, covered unconformably by Cenozoic and modern forma- 
tions. In some of the rivers of this division are rich gold placers. 
The third division is the delta on the eastern coast. Evidence fur- 
nished by alluvial deposits and coral reefs indicates recent subsidence 
until a few years ago, when elevation commenced. The fourth divis- 
ion is on the western side of the first (central) division. Its rocks 
are generally similar to those of the second division. In some places 
dykes are connected with laya-flows. In the valley of the Rio Viejo 
is a tertiary mammaliferous deposit with Toxodonts, ete. The fi 
division occupies Western Nicaragua, and contains several small 
crater-lakes of the Vicksburg, Yorktown, and Sumter periods; all 
the post-Mesozoic Nicaraguan volcanoes are in this division Quart. 
Jour. Geol. Soc., 1892 
Cope’s Lectures on Geology and Paleontology.'—This 
series of lectures prepared for the Extension Course of the Univer- 
sity of Pennsylvania forms a basis for the study of geology. They 
are rather elementary in character, and at the end of each chapter 
will be found directions as to collateral reading and home work. 
Part 1, Geology, opens with a short introduction defining the sub- 
jects which constitute the science of geology. The author then takes 
up in turn structural, dynamic, historic, and lithological geology. 
The salient features of each are put concisely, but clearly, so there 
can be no misunderstanding of the subject. The latest discoveries in 
American stratigraphy are noted. An addition of importance is 4 
chart which gives the realms, systems, and series of interior and coastal 
America, Europe, and other countries, showing at a glance their rela- 
tions to each other. 
Part 3, Paleontology, embodies the latest reliable information as to 
the characters of the Vertebrata, their homologies, affinities, and ge 
logical position. The author adopts the division of the vertebrata 
into four superclasses, Hemichorda, Urochorda, Cephalochorda, con- 
Syllabus of a course of lectures on Geology and Paleontology. Part 1, Geol- 
ogy, Part 3, Paleontology; by E. D. Cope, Ph. D., Professor of Geology and Paleon- 
tology in the University of Roca a Phila., 1891. For sale by A. E. Foote, 
4116 Elm Ave., Phila. 
