22 OHIO STATE ACADEMY OF SCIENCE. 
set adrift to show direction of the currents; also a numbered 
question list, enquiring where and when found, whether still 
adrift at the time, and the name and address of finder, also a re- 
quest that the finder mark the place on the map enclosed. To 
make the bottles more conspicuous, each was fastened to a board 
about 15x17 centimeters and one centimeter thick, the corners 
painted orange and at the center a large number in black corre- 
sponding to the number on the slip within. The first 26 bottles 
were so fastened to their boards that they would float along- 
side, but all after that were weighted with sand so as to make 
them sink beneath the board and so lessen the direct effect of the 
wind. All the bottles were heavy and, even when floating, the 
direct action of the wind upon bottle and board must have been 
relatively small as compared with the effect of the water, except 
when the latter was nearly at rest. Most of the bottles, when im- 
mersed, displaced about 700 c.c. of water. The wire was so 
adjusted as to bring the bottom of the bottle about.a foot below 
the surface. 
RESULTS 
I have found no evidence of a persistent current carrying 
the sewage to the waterworks crib. I have found no evidence 
of a persistent current anywhere. Eighty bottles were set adrift 
between July 26 and December 6, 1902. Before the freezing of 
the bay in December, 44 had been found and reported. A “few 
others will probably be heard from in 1903. 
Two bottles thrown off the Cedar Point boats when about 
228 rods from the Cedar Point dock, one August 1, the other 
August 8, were both found near No. 10 culvert east of the stand- 
pipe. Bottles were set adrift at this place at four other times. 
Only one has been heard from; it had gone in a direction nearly 
opposite to the others. In no other case have two bottles set 
adrift at the same place on different days been found in the same 
place, but in several cases they have been found in quite different 
directions from the starting point. In all cases (29 in number) 
in which the bottles were found within four days after being 
put in, the course they took can be readily accounted for. So 
closely dependent is the course upon the direction and velocity 
of the wind for some time before and after the bottle is put in 
that one would not require a very long experience to predict from 
the wind record approximately the course the bottle would take. 
The bottle, however, might not be found until it had changed or 
even reversed its course. The bottle may go against the wind 
or make a large angle with it. If the wind is strong, the bottle 
usually goes in the same, general direction. So long as it re- 
