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a 
Prof. Bache’s Lecture on the Gulf Stream. 323 
_ Navigators have noticed these changes of temperature and 
have supposed themselves at each oceurrence of warmer water 
to be in the hottest water of the stream and so have been greatly 
embarrassed and have deemed the phenomena and limits of the 
ulf Stream to be very irregular 
The cold water between the Gulf Stream and the shore has 
also bands less regular than those beyond the axis of warmer and 
cooler water. 
Florida, a different type-curve. The cold wall is less distinctly 
marked and the rise of temperature is less marked. It rises how- 
ever to an axis near the coast of Cuba. Throughout the length of 
the Strait there is but one maximum of temperature and the 
bands belonging to the Atlantic regimen do not occur in the 
straits. (See diagrams Nos. 8, 4, 5, 6, Plate IL.) The cause of 
ip change of regimen will be seen in presenting the other form 
ol diagram, 
(b.) Curves of depths at the same temperature.—I have selected 
curves from the southern portions of the work, vartly because 
the bottom has been struck in the sections agd the diagrams show 
its sections as well as those of the stream, and partly to show 
how fully the deductions in regard to the divisions of the stream, 
apply to these, as well as the more northern sections. The 
Charleston section of Lieut. Maffitt is given on clagram +VO. 9, 
late I. The surface curve, notwithstanding 
x 
in the cold current which is not therefore, as has been supposed, 
cut off at Hatteras, the curve of 72° reaching to the coast and 
an nearly reaching it. The Cape Florida diagrams (Nos. 3 and 
7, Plate IL.) give two maxima with indications of a third and on 
corresponding minima. The cold wall cannot be recognize 
Upon it, probably for the want of one or two, more positions. 
ld water lies in the valleys 
and passing along the bottom rises upon the tops of the hills. The 
Rivers af thinvange of hills was made at nearly the same time 
