200 OnIO STATE ACADEMY OF SCIENCE 
from which measurements could be made, and scarcely anything 
visible within two miles whose location is given on any chart or 
map. The plat in the auditor’s office was found to be in error 
to the extent of forty-five rods. No detailed and accurate map 
of the region exists to this day. In the work done the first 
winter the importance of careful location of the holes with ref- 
erence to points on shore was not realized, their location with 
reference to other holes sufficing to show—what was not pre- 
viously known—that it was possible to trace these submerged 
valleys. Sometimes in tracinga-valley it became desirable to 
test the bottom a short distance to one side of the line we had 
been following. Accordingly we measured off 16 rods or some 
other distance at what seemed to be a right angle to the main 
line and on making a hole there decided to go farther in the same 
direction. The deviation from the direction intended was usu- 
ally discovered in some way either before or at the time of 
platting the work on the charts, even though it required a jour- 
ney of several miles the next day to reach the spot again and 
trace the angles on paper. The location of borings shown on 
Map III, with the exception of those enclosed in parenthesis, are 
believed to be correct within ten rods or a little more, most of 
them much nearer than this. With reference to other borings 
in the vicinity the error in the location is very small, if made the 
same winter. 
Nearly a hundred boys have assisted in this work and in 
determining the age and height of the aqueous deposits in the 
ridges on Cedar Point, some of them many times. Altho cerv- 
ing without pay, often in bad weather and enduring fatigue they 
have made no complaint. I wish there were space to mention 
their names. On one occasion a boat was taken along on the 
ice, at another time a life preserver. Both proved useful. Twice 
at least the shore has not been reached until after dark and on 
one of these occasions there were some anxious parents. Many 
mittens have been lost or discarded and many tools, large or 
small, gone to the bottom of the bay or farther, but no lives have 
been lost or hmbs broken. Feet have been wet and sometimes 
more, but few colds have been taken and many probably avoided 
or cured by the vigorous outdoor exercise. 
I am indebted to Mr. August Klotz who has generously put 
at my disposal without charge the resources of his machine shop, 
and to Charles Judson, C. E., who has often loaned me his 
instruments and assisted in other ways. 
