o transmit herewith a copy of the journal of Assistant F. H. Gerdes, United States Coast Survey, showing the services rendered to the fleet under command of Flag-officer Farragut, United States Navy, and to the mortar fleet under command of Captain D. D. Porter, United States Navy.
I am, very respectfully, S. P. Chase, Secretary of the Treasury. Hon. Gideon Welles. Secretary of the Navy.
Extracts from a report of Assistant F. H. Gerdes, commanding surveying steamer Sachem, to Professor A. D. Bache, Superintendent of the coast Survey.
April 13.--At daylight of the 13th of April, I again got under way and took the lead, the gun-boats of the flotilla and the naval vessels in the vicinity following the Sachem.
The following disposition was made of my party:
1. Sub-Assistant J. G. Oltmanns and Mr. T. C. Bowie repaired on board the Owasco, and used during the day a boat and armed crew from that vessel; they ascended the river on the west bank.
2. Myself and Assista