Be Review of the Results of the U. S. Coast Survey. 81 
ments of the different ports. ‘The necessity of both these classes 
of observations is sufficiently obvious, but the superintendent has 
mon staff gauge. The former possesses th 
esent the times and the ordinates the corresponding heights 
- The number of principal stations for tidal observa- 
‘Was 78, of which number 45 were on the Atlantic Coast, 
“nstruction of accurate and reliable tide tables. _ 
tis not saying too much to assert that no single series of 
—afal observations yet made possesses so high a scientific value as 
7.28 of the Coast Survey. Not only is the range of coast 
/Mtudied greater, but the character of the tides themselves is 1n & 
_ SECOND SERIES, VoL, XXV, NO. 18.—JAN., 1889. 
11 
