U. S. Coast Survey Report for 1860. 241 
The number of geographical determinations published by the Coast 
Survey, exclusive of those made within the past year, is seven thousand 
one hundred and seventy-eight ; the magnetic variations given are up- 
wards of two hundred; the tidal constants for harbors and coasts, one 
hundred and ten; and the maps and charts of harbors, bays, inlets, 
sounds, shoals, &c., drawn, engraved, and published, three hundred, ex- 
clusive of progress sketches and diagrams.” 
aps and Charts—“ Within the past year, one hundred and eleven 
completed, and fifty-five are in progr 
s. 
"or and charts of the first class, and an equal number charts of special 
and eleven titles, of which sixty-eight are of first class or finished maps. 
€ total given is exclusive of seventeen plates of progress sketches. 
ination of various reefs and ledges, investigation of channels and cur- 
mnie, &e., with other like services to navigation. 
Pes Sper 
aud on the conan of Cape Cod, to determine the feasibility of a canal 
tution, the Superintendent remarks, we have been engaged for some 
Atos endeavoring to obtain all the data existing for heights in North 
America, During the past year a new circular has ; 
“ngineers, presidents and superintendents of railroads, and to geologists, 
®xplorers, and other men of science, to obtain additional results, and with 
"uch success, 
