CONTENTS OF VOLUME XXIII. 
NUMBER LXVII. 
Arr. I. Approximate Cotidal lines of Diurnal and Semi-diurnal 
Tides of the Coast of the United States on the Gulf of 
Mexico, with two plates; by A. D. Bacue, - * 
Il. Notes on the Progress made in the Coast Survey, in Predie- 
tion Tables for the Tides of the United States te bY 
A. D. Bacue, . a j 
III. Observations to determine the cause of ei increase of Sandy 
Hook, made by the Coagt Survey for the Commissioners on 
Harbor encroachments of New York; by A.D. Bacue, - 
IV. Notice of Observations to determine the Progress of the tidal 
wave of the Hudson River, made by the Coast Survey for 
the Commissioners on Harbor Encroachments ; w A. ah 
Bacue, 
V. On the tenet pti = the Beemer éciee 76 
passage of a Revolving Storm, such as a Hurricane or Ti ea 
nado, being a small rise and not a sie fall ; by ey 
CHAPPELLSMITH, - 
VI. On the Spirality of Solon in Whirlwinds be Torodoos 
by W.C. Reprietp, —- 
VII. On the Application of the Mechanical Theory of. is to 
the Steam Engine ; by R. Cravsivs, 
VIII. On the Agency of the Gulf Stream in the Econ, of rs 
Peninsula and Keys of Florida; by Josern LeConre, M.D., 
IX. On Screw-Propellors ; by W. Rocess Horxins, z 
X. Statistics of the Flora of the Northern United Seen by 
Asa Gra¥,. - . . 
XI. Observations on the Falls of Sai: with riflicini to ss 
changes which have taken poe and are now in in PRT 
by R. Benois . 
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