. On the Tides of the Gulf of Mezico. 
The Jast chart in 1848 of the Master of Trinity (Rev. Mr. 
Whewell*), to whom this subject owes so much of its progress, 
in comparison with that of Rear Admiral Lutke,t or with his 
own earlier map,t shows this tendency, the inclination of the 
lines to the coast being assured at each step. 
Art. V.—WNotice of the Tidal Observations made on the Coast 
of the United States, on the Gulf of Mexico, with type curves 
at the several Stations, and their decomposition into the curves 
of diurnal and senii-diurnal tides ; by A. D. Bacue, Sup’t. 
(Communicated 6 the American Association for the Aarencarent of Science under 
Authority of the Treasury Department.) 
Aisi ct.—The stations are eighteen in number. At four, 
hourly observations were made for one year or more, and at the 
remainder for not less than two lunations and generally for more. 
The stations at Cape Florida, Indian Key, Key West and Tor-_ 
tugas were intended to trace ‘the tide wave through the Florida 
Channel ; those at Egmont Key, Tampa, Cedar Keys, and St. 
Marks, to trace it along the Western Coast of Florida; at St. 
George’ s, Pensacola, Fort Morgan, Cat Slee and E. Bayon, (en- 
trance to the Mississippi,) to trace it along the south coast o 
Florida, Alabama, Mississippi and part of Louisiana, at E. Bayou, 
Derniére Isle, Calcasieu, Bolivar Point and Galvest stad Seg on and 
Brazos Santiago for the coast of Louisiana and Tex 
The observations were chiefly made by Mr. Getic Wiirde- 
mann with different assistants. At a few stations they were made 
by Corporal Thompson of the Engineers, Mr. Bassett, Mr. Tansill 
and Mr. Mnhr. The reductions were made in the Tidal Division 
of the Coast Survey office by Assistant Pourtales, Mr. Gordon, 
Mr. Mitchell, Mr. Heaton and others. The methods used were 
those pointed out in my previous papers to the Association, the 
ecomposition being in some cases made graphically, and at a 
rt of the stations Where the semi-diurnal wave is considerable, 
the ordinary method of working being used as well as those con- 
sidered peculiarly applicable to these tides, As it would be tedi- 
ous to present the results of these elaborate discussions in detail, 
when the co-tidal lines are introduced, I have thonght it best 
briefly to refer now to the types of different tides, and to present 
to the Association the diagrams for the several stations showing 
upon a uniform scale the normal stolons and their decompositions 
into the diurnal and semi-diurnal wav 
eae 3 Transactions, vol. Ixi, 1848 
me Bulletin de oe Physico- sico-Mathematique de TAcad. Imp. des Sciences de 
; Royal Societ ode edad its vol. li, cag 
