1447 
4.0 m.m. 
— 14.8 
4.1 
8.4 
Del 
2.0 
os 
2.8 
0.8 
2.9 
9.8 
— 4.6 
Be wins 
b++ | +++4 | 
A periodicity looks less likely here than in the first case. Further 
I arranged the bi-monthly averages according to the period of 438.096 
days, which, according to a paper by Scnumann from Vienna, should 
represent the length of the CHaNDLER’s period. This value differs 
very greatly from the results obtained in Leiden, and is a priori 
improbable as it is only theoretically deduced from the elements of 
the moon’s orbit, without taking into account the elasticity of the 
earth, which certainly has a great influence upon this value. From 
all the observations from 1855 to 1912, arranged according to the 
phases of a periodic variation in 458.096 days, in distances of a 
month, I got the following figures for the sea level. 
