1884. ] Topographical Phenomena in Indiana. 367 
Fic. 14¢—Female generative apparatus of Belostoma (X }), showing the flexure 
of the ovaries and immature ova in their upper part. 
Fic. 15.—Portion of brain and optic nerves of Belostoma, to show the branching at 
the extremities of the optic nerves. 
Fic. 16.—Cross-section of head of Belostoma from above, to show the auditory 
chambers and parts of the enclosed antennæ. 
Fic. 17. Nervous system of Ranatra (X 4). The branching of the nerves in the 
abdomen partly diagrammatic. 
Fic. 18.—Antenne of Belostoma. 
Fic. 19.—Antennz of Perthostoma, 
Fic. 20,—Antennz of Ranatra. The last three figures from camera lucida sketches, 
Fic. 21.—Cross-section of pumping apparatus, showing how the muscles are attached 
to the chitinous threads, and how they divide into two sheets as they pass up- 
wards, 
:0: 
TOPOGRAPHICAL PHENOMENA IN INDIANA. 
BY JOHN T. CAMPBELL. 
sete fifteen years ago I was engaged in helping to make 
several surveys in Western Indiana and Eastern Illinois for 
railroad purposes. In such work one is apt to notice topography 
sharply. While thus employed I observed that the hills along 
all the east-west flowing streams on the up or table-lands 
Were steep and abrupt facing northward, and on the opposite side, 
facing southward, they were gentle slopes. This was true 
throughout the glacial drift region. As the streams in nearing 
e Wabash river wore down below the drift, the slopes reversed, 
and the steepest hills faced the south, but the difference in slope 
'$ not nearly so noti¢eable as the opposite in the drift. 
At the time I first observed this peculiarity of slope, I had read 
no work on geology, and had but a very limited idea of dynami- 
cal geology, derived from a meager recollection of a few lectures 
on the subject, heard several years before. I supposed these phe- 
nomena were not only observed and described, but accounted for. 
In my subsequent reading on the subjects which ought to cover 
_ “us, T have been nota little surprised to find that these facts have 
-n ily not been accounted for, but not observed. After my 
a > to find it where I expected, I inquired of men eminent for 
ras knowledge of such subjects as should include this, and have 
that not one out of nine seemed to have observed or heard 
iten Om d a doubt of the ex- 
oi a — Erom several even expressed a 
my subsequent readings and inquiries, I have greatly 
