© is eee ea gece ey EP ae Te eee RS <a) Wee vee ee AS PST OT SAT pa MP BRN age ees rote he a tw SR Sa ER ripe ES ee ag Sora eee 
H. Mitchell on recent Soundings in the Gulf Stream. 69 
and briars. About one year ago Prof. Cox revisited these mines 
for a company who had in view to lease or purchase them; it 
was during this visit that the gray copper above referred to was 
discovered. This ore has previously escaped the observation of 
others who had explored these mines. It is impossible at pres- 
ent to see the ore in place, and those who previously worked 
the mine mre conflicting statements as to the manner in which 
the ore is 
The vein- ane and associated minerals with the galena are 
white quartz, spathic iron, zinc blende, copper pyrites, gray cop- 
per, tennantite and nacrite. 
The mines are now in the hands of a new company, and the 
latest information from their operations are, that matters look 
well; the vein now being worked is nearly three feet wide, 
rincipally lead ore, the “balance being zine blende; twenty 
Laeits are at work, and the shaft is down forty-five feet. M 
opinion is, that in time this mine will become of considerable 
importance, and a to further developments of argentiferous 
galena in that regio 
Art. X.—On recent Soundings in the Gulf Stream. — Abstract 
of a paper read before the National Academy of Sciences; 
by Henry MIrTcHe xt, Assistant U. 8. Coast Survey. 
EARLY in the spring of the present year an application was 
made to the Coast Survey by the International Ocean Telegraph 
mpany for information relative to the form and ged of 
the bottom of the Straits of Florida between Key West and 
Havana along the proposed track of the submarine fled h 
cable which is to connect the United States with the West India 
Islands. It was clearly the province of the Coast Servis to 
supply information of this sort, and a special survey was there- 
fore ordered under instructions from Mr. J. E. Hilgard who, dur- | 
ing the illness of Prof. Bache, conducts the work of this bureau. 
These instructions were carried out carefully and under favoring 
circumstances, so that the results are entitled to confidence. 
The dianaect from Sand Key, on the extreme southern pote 
since have been executed, In fact, however, the Should ie 
a new problem to the engineer, viz: to lay a cable nearly at right 
angles io « strong stream, or system of streams, flowing through a 
rocky pass of great depth. The new weft if it does not, as is 
hoped, supply the elements for the solution of this problem, at 
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