. qualifications briefly. 
PAST AND PRESENT 
By SAMUEL WENDELL WILLISTON 
ona Professor of Paleontology in the 
Umirersity of Chicago 
( ak and gaetodtiae geographical 
the best-known feature of the Illi- 
has been prepared for the benefit 
ho are interested in knowing more 
: Tegion | ce can be Elo By 
1 in 
Peds Williston, who is widely known: as a 
student, of extinct reptiles and as'the author of 
| American Permian Vertebrates, which has now 
 beeome a standard work, presents in this new 
volumea summary, divested as far as possible of 
as aie aid its ce funneeade has 
f eS ou as as beautiful 
knowledge concerning the reptiles of the seas, 
lakes, and rivers of past and present times. ~ _ 
The numerous illustrations, in large part from 
the pen or brush. of the author himself, include 
not only living types and twenty-four restorations 
* of extinct forms, but also many figures elucidat- 
ing the structures and habits of the animals. 
art and the UE settle- 
nd development of the region; Part 
the geology of the park; and Part Til, 
botany. 
130 pages, cloth; $2. 00, age $2.15 | 
viti--ase pages, royal 8v0, cloth; $3.00, postpaid $3.20 
The University of Chicago Press 
ae - rt - Illinois 
oe Ciniversity Press 
‘POSITIONS OF ALL KINDS 
i) Never was the demand so great for qualified teachers and 
1a “specialists. For ten years we have given our time and |} 
| energy to this work. Write for our free literature. State 
Co-operative Instructors’ Association 
ii Marion - - Indiana 
“ossil Plants. A Text-Book for Students of Botany and Geology. By A. C. 
ie SEWARD, M.A.,F.R.S. In4gvols. Demy 8vo. Vol. I. With 112 illustrations. $3.60. Vol. II. 
With 266 Btcreitions: $5.60. Vol. III. With 253 illustrations. $6.50. Vol. IV. With 
390 illustrations. $6.50. 
>alaeontology—Invertebrate. By Henry Woops, M.A., F.G.S. Crown 8vo. Fifth 
ie edition. _ Revised and enlarged, with 173 illustrations. $3.75. 
Petrology for Students: an Introduction to the Study of Rocks under the ~ 
oe Microscope. By Atrrep Harker, M. A., F.R.S., F.G.S. Fifth edition, revised. Crown 
3 8vo. $2.75. 
Treatise on ee eae By W. J. Lewis, M.A. Demy 8vo. $4.50. 
: ee: 8vo. 2 .00. 
cto to e eey By J. E. Marr, ScD, F.RS., F.G.S. Crown 8vo. $r.30. 
"The MacMillan ee Meonc: in the United States 
64 and 66 Fifth Avenue, New York City 
| WATER REPTILES OF THE | 
unnecessary scientific details, of our present \ 
