46 On the Gulf Stream and the Keys of Florida. 
TABLE—conciuben. 
t Pp A g A T .£ A 
182° 7899°52 : 179°735 ; 8177 
183 | 8080-84 cat 182-940 S 83407 ee 
185 | 845323 | 187 189-425 8677 1688 
35 IgI*I2 7 +320 4 1714 
— coe 194°47 ry +4 "370 oes 1743 
187 8838'82 197-86 196°165 : ao go2 1763 
188 POS ato 199°565 445 91999 1792 
189 9237°95 0895 203010 480 93791 814 
io | 9ldr70. | aofha3 | 2064. | 3515 | 9003 | i637 
1‘ : 
192 9862-71 ott 213 _ os 1885 
I 10078°04 : 217°1 IOTIQ2 
he 10297°O1 ate ie 220°795 a I a sae 
195 | 1051963 | 3°23 224470 | 3.4/5 1050 te 
196 ag aa 35 228-185 31550 107018 : 
197 10976°00 : 3-88 231-935 3405 I aa 
198 11209°82 - ‘ 235-730 79 T11029 ood 
199 tisdede 237-64 239570 3-840 13077 2048 
1688-96 | 2475° | 243-455 wee fam eT 8 78 a 
Art. VIIL—On the Agency of the Gulf Stream in the Formation 
of the Peninsula and Keys of Florida; by Josep a ae 
M.D., Prof. Natural elsdoen University of Geor 
Read before the American Association for the Advancement of Science at Albany, 
In the winter of 1851, and during the months of January and 
February, I enjoyed the rare opportunity of visiting and exam 
ining the keys and reefs of Florida, in company with Professor 
Agassiz. I then and there became deeply interested in a subject 
which has continued to occupy my thoughts from time to time until 
now—viz., the mode of formation of the peninsula of Florida. 
Until the time referred to, nothing definite was known of the 
geology of Florida, but it was supposed to consist of a southward 
prolongation of the eocene of Georgia and Alabama, and its shell 
limestone to bear some general resemblance to the white limestone 
of these states. But the observations of Professor Tuomey durin 
the summer of 1850,* and the more full and careful observations 
of Professor Agassiz during the following wintert, brought to 
light the eee fact, that the keys and the larger portion of 
the peninsula of Florida are of recent origin, and as far as could 
be examined, the work of corals still living in the vicinity, and 
still engaged in the work of extension; that they are in fact, su- 
—* - ee the result of the growth of successive coral 
. = arranged, one outside of yo aa: sm 
no: > an ect in the present r to show 
that coral agency pan ce dalibcues Bt the for the phe- 
nomena, bat that there Se bet been another and still more powerful 
* This Journal, [2], vol.i, p. 390. + Report of Coast Survey for 1851, p. 145. 
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