124 Tne American Geologist. February, 1896 
It was during this period of physical incapacity that Von 
Rebeur produced liis most remarkable work, and became tin- 
pioneer of a new seismology. Commencing with the endeavor 
to measure lunar gravitation, he discovered the diurnal wave, 
that earthquakes eotdd be recorded at stations distant more 
than a quarter of the earth's circumference from their origin, 
came in contact with the ubiquitous tremors and observed 
many other phenomena connected with the movements of our 
so-called terra ftrma. These discoveries attracted the atten- 
tion of other observers, and horizontal pendulums were estab- 
lished at several of the more important observatories in Ger- 
many and Russia. 
Von Rebeur's last work was an endeavor to obtain co-oper- 
ation for the observation of these instruments throughout the 
world, a scheme, which, although he has not lived to realize it, 
will, in all probability, be accomplished in the near future. 
His ability and energy are testified by the works he leaves be- 
hind, and his modesty and kindly nature are spoken of by all 
who knew him. [Geol. Magazine.) 
Ohio Academy of Science. 
The fifth annual meeting of the Ohio Academy of Science 
was held at Cincinnati, by invitation of the Cincinnati Soci- 
ety of Natural History, on December 20th and 27th. The 
reading of papers on geology, especially those on the geology 
of Ohio, formed a prominent part of the meeting. The follow- 
ing geological papers were presented: 
Whence came the Devonian fishes of Ohio? E. W. Claypole. 
Observations on some Niagara limestone pits rilled with clay. J. H. 
Smith. 
The formation of natural bridges. Gerard Fowke. 
The crystallized minerals of northern Ohio, particularly of the Lake 
Erie islands. Edo Claassen. 
Formation of the beach flats of Pike county. W. G. Tight. 
The evolution of several well known Paleozoic genera as shown by the 
introduction of new speeies. J. A. Bownocker. 
The movement of glaciers. J. J. Janney. 
The paleontology and stratigraphy of the Upper Helderberg rocks of 
central Ohio. J. A. Bownocker. 
The origin of the Ohio river. W. G. Tight. 
A new Titanichthys. E. W. Claypole. 
Iowa Academy of Sciences. 
At the recent meeting of the Iowa Academy of Sciences the 
following papers dealing with geological subjects were pre- 
sented : 
Recent developments in the Dubuque lead and zinc region. A. G. 
Leonard. Attention was called to the introduction of improved min- 
ing and pumping machinery which has allowed the recovery of ore from 
levels below any previously worked in the county. 
Some facts brought to light by deep wells in Des Moines county, Iowa. 
F. M. Fultz. Deep wells penetrating 233, 184 and 188 feet in the drift 
are noted and interpreted as indicating preglacial river channels. This 
would indicate a much later date for the origin of the drainage than has 
been previously maintained by Mr. Fultz. 
