ELEVENTH ANNUAL REPORT. a3 
‘mains in the bay, its course depends largely upon whether the 
water is rising or falling. This in turn depends mainly on the 
wind. If for several days the wind does not vary much in ve- 
locity or direction, the level of the bay adjusts itself to it and 
no marked change of level will occur until the wind lessens or 
increases in force or changes in direction. If strong westerly 
winds have prevailed for some time and within 24 hours change 
to east or northeast, a strong current sets into the bay, while a 
reverse change of the wind will cause a strong current outward. 
At any point in the bay the current depends partly on the position 
with reference to shores or shoals, partly on the direct action of 
the wind on the water in that part of the bay, but chiefly on 
whether at the entrance to the bay the water is entering or leav- 
ing. These three factors affect both the direction and velocity 
of the current. 
EXAMPLES: 
Bottle No. 14ab was set adrift October 25 at 9:30 a. m. half 
way between the foot of Columbus avenue and the west end of 
Johnson’s Island. It was found the same day at 4 p. m. lying on 
the beach one and one-third miles west of Venice—more than 
three miles in a straight line from its starting point. The day 
before, the wind had been fresh from the southwest. On the 
25th it was fresh from the northeast. Bottle No. 37a, started 
from the same place September 27 at I p. m., was found the next 
morning at nine o'clock broken and among timbers on the lake 
side of Cedar Point about three miles from the light-house. On 
the 24th and 25th the prevailing direction of the wind was from 
the east with maximum velocities of 21 and 18 miles. On the 
26th it was light and mainly south, but on the 27th, the day the 
bottle was put in, it became southwest, blowing at one time 22 
miles from the west and in the night 30 miles from the west. 
This carried the bottle into the lake and then the wind, becoming 
light without much change of direction, caused the water to set 
back and cast the bottle ashore on the east side of the Point. 
Four bottles were thrown off the end of the Short Line 
dock. Only one has been heard from. It was found on the 
sand bar that separates Biemiller’s Cove from the bay about three 
fourths of a mile from the Cedar Point dock and three miles from 
its starting point. It had drifted this distance between 6:55 
P. M. August 10 and 1:30 P. M. August 11. On the 9th the 
wind was east but on the toth it changed to south, southwest 
and west causing a current that carried the bottle out into the 
bay and then toward the entrance. On the 11th it blew from 
the west and later from the northwest with the maximum velocity 
