MARYLAND GEOLOGICAL SURVEY 119

Henry flag-staff, " " Lazaretto, " " Buchanan, " " Fishing Point, " " Sel-
lers' Point, " " Hawkins' Point, " " Fort Carroll Light House, " " Spar-
rows' Point, " " Rock Point, " " North Point " (upper light), " North
Point" (lower light), "Bodkin, " and "Seven-foot Knoll Light
House. " '

SURVEY OF 1876. —The interest manifested by the municipality of
the city of Baltimore in regard to permanent improvements of the
harbor took form in May of this year. The Legislature of Maryland,
in its session of 1875-76, passed a special appropriation of $5000 for
the purpose of a proper topographical survey in furtherance of that
purpose. The bill provided for the co-operation of the Coast Survey
in the work, and requested the appointment by the President of a
Commission composed of the Chief of Engineers, the Superintendent
of the Coast Survey, and the U. S. Engineer in charge of harbor and
river improvements at Baltimore.

The Commission, appointed as requested, consisted of Major-Gen.
A. A. Humphreys, Dr. C. P. Patterson, and Major W. P. Craighill.
J. W. Donn, Assistant Coast Survey, was assigned to make all surveys
needful for the deliberations of the Commission in the establishment
of permanent harbor lines. These surveys were shown upon five
sheets of wharf, pier and shore lines, and the same number included
full hydrographic details.

For this special survey a careful triangulation was made during
July and August, 1876. In the course of this triangulation the fol-
lowing easily recognized points and discoverable with little trouble at
the present time were determined: " Bayview Asylum, " "Washing-
ton Monument, " " Light Street Corner, " " Gail & Ax's Cupola, "
"Malt. House, " " Knabe's Piano Factory, " "Chase's Wharf, "
" Bonded Warehouse, " " Abbott's Foundry, " " Mill Cupola, " " Cen-
tral Cupola, " " Green Cupola, " " Elevator B, " " Lazaretto, " " Iron
Foundry, " " Parapet, " and " Fort McHenry flag-staff. " Subsequently
the entire wharf-line was measured carefully with a steel tape as a
check and for comparison with the plane-table determinations. As
usual, the topographical work was done entirely upon the ground, the
only record being delineations upon the field sheets. Comparisons