544 W. Ferrcl— Meteorological effects upon the Tides, 
seven for the value of the constant, which is nearty the same as 
the value obtained for Boston harbor. 
In order to obtain the effect of the winds upon the heights 
of the tides, all the residuals for the six years belonging to 
each of the eight principal points of the compass were grouped 
together, and also the corresponding averages of the forces of 
the winds and of the barometric pressures. The forces of the 
wind in the observations were represented by the numbers 0, 
1, 2, 3 and 4, 0 denoting a calm, and 4 the strongest win 
recorded. The following results were thus obtained. 
No. of Average 
Wind. | observa. | force or | Prromere® | residuals. | residuals, 
N. 244 16 | 30°007+-005| +0-21| +0.21 
N.E. 317 17 +-009 23 0.24 
E. 274 1:3 4-055 0-04! 0°07 
S.E. 131 15 4-053} +0°02|  +0°05 
S. 165 1:8 —-074| —0-03) —0-07 
S.W. 796 15 —-021 0-10| 0-11 
W. 677 16 —-073| 0°18] 0°22 
N.W.. 527 16 +001, O11; —O-11 
Calm. 946 4-051} 0-01! ~=—« +002 
The number of observations in the second column denotes 
the relative frequency of the winds from the different points of 
the compass, and the third column gives the average force of 
each wind according to the scale which has been given. e 
fourth column gives the mean barometric pressure, and the 
pressure for each wind. It is seen that with winds from N.W. 
_ It is pretty generally thought that the winds cause very co 
siderable changes of the sea-level, but it is seen from the last 
column of the table above, that an average N.E. wind raises 
the sea-level only about three inches, and a S.W. wind de- 
