AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[SECOND SERIES8.] 
ART. I.—Approximate Cotidal lines of Diurnal and Semi-diurnal 
Tides of the Coast of the United States on the Gulf of Mexico; by 
. Bacuez, Superintendent U.S. Coast Survey. 
(Communicated by authority of the Treasury Department.) 
AT successive ‘meetings of the American Association I have 
eats oe approximate cotidal lines for the Atlantic and Pacific . 
Coasts of the United States, drawn from the tidal observations 
of the Coast Survey. I now present si imilar lines for our coast 
on Po Gulf of Mexico. 
oe is a very different one from either of the others 
retuned ve The tides on the Atlantic Coast are of the regular 
semi- tial class and easily discussed by the forms pies elab- 
orately prepared by Lubbock and Whewell. he aioe 
pel is not large; indeed though easily recogniz 
periods and then quite characteristic, in are as je fi 
ike ee Bde pu comp ikaively Gacertt discussion ae 
has been made of these tides requires many steps in the discus- 
sion to be epics, ands oe Sm leaves us in doubt as to the 
acon stains, vo. ste NO. 67,—JAN., 1857, 
