Coast Survey Report for 1853. 207 
their minute and continuous records the elements of wider and 
more critical investigations into tidal phenomena. All these eb- 
_ servations are now regularly reduced by a special “tidal party” 
uuder the particular direction of Prof. Bache. 
Report of 1853 (Appx. No. 26) contains a very valuable 
table, embodying the principal reduced results at 64 important 
tide stations on the Atlantic, Gulf and Pacific coasts. Appendix 
Nos. 27, 28 and 29, contain elaborate discussions by Prof. Bache, 
of the tides at Key West, and Rincon Point, San Francisco, in 
which they are reduced and resolved into results of the physical 
tidal theory. ‘The curves of the phenomena of the theoretical 
components are presetited in three plates. Prof.-Bache thus sums 

Joast Survey developments established the contrary, were be- 
lieved to depend upon the winds which have the character of 
trade-winds, and, therefore, considerable regularity along that 
coast. The tides of our Pacific coast ebb and flow twice in 
coast having been made in close connection with the other parts 
of the hydrography, the statious still wanting will be filled up as 
We advance. A few stations are still required on the Gulf of 
exico to complete the general determination of its tides from 
Cape Florida to the Rio Grande. We have already found nearly 
the dividing position, Cape St. George, Apalachicola, where the 
tides resemble on the one side, eastward, those o Cedar Keys, 
ey West and Tampa Bay, ebbing and flowing twice each day, 
with a large diurnal inequality, and ou the other, westward, re- 
semble the tides at Mobile entrance, the Delta of the Mississippi, 
Galveston and the Rio Grande evtrance, ebbing and flowing, as 
@ general rule, but once in twenty-four hours. : 
Report coutains a detailed description of Saxtor’s self- 
Seaward on a difficult open coast near Nantucket (Appendix No, 
13); and finally a report of operations in obtaining off-shore or 
