By authority of The Governor of The Panama Canal some of the duties of the Branch Hydrographic Offices are performed by the Captain of the Port at Cristobal and the Captain of the Port at Balboa. Reference charts and sailing directions may be consulted at these offices, and shipmasters may receive the Pilot Charts, Notice to Mariners, and Hydrographic Bulletin in return for marine and meteorological data reports. Observers’ blanks and comparisons of navigational instruments may be obtained at the same time. Neither of these offices maintains a regular mailing list for the distribution of publications; such mailing lists are maintained at the Branch Hydrographic Offices along the United States coasts (see addresses elsewhere on the chart) and at the main office, Washington, for the benefit of those shipmasters and officers who contribute data regularly. SALE OF HYDROGRAPHIC OFFICE PUBLICATIONS.—The Captain of the Port of Cristobal, Canal Zone, is an agent for the sale of Hydrographic Office publications. Applications should be made to the Captain of the Port at Cristobal or at Balboa. =16.= BRANCH HYDROGRAPHIC OFFICE ADDRESSES BOSTON, MASS. 14th Floor, Customhouse NEW YORK, N. Y. Rooms 301–302, Maritime Exchange, 78–80 Broad St. PHILADELPHIA, PA. Main Floor, The Bourse Building BALTIMORE, MD. Room 123, Customhouse NORFOLK, VA. Room 16, Customhouse SAVANNAH, GA. First Floor, Customhouse NEW ORLEANS, LA. Room 215, Customhouse GALVESTON, TEX. Room 301, Customhouse SAN JUAN, P. R. Federal Building SAN PEDRO, CALIF. Immigration Building, San Pedro SAN FRANCISCO, CALIF. Merchants’ Exchange PORTLAND, OREG. Room 407, Customhouse SEATTLE, WASH. Room 408, Lowman Building DULUTH, MINN. Room 1000, Torrey Building SAULT SAINTE MARIE, MICH. Room 10, Federal Building CHICAGO, ILL. Room 481, Post Office Building DETROIT, MICH. 7450 East Jefferson Ave. CLEVELAND, OHIO Rooms 406–408, Federal Building BUFFALO, N. Y. Room 345, Post Office Building HYDROGRAPHIC INFORMATION OFFICE HONOLULU, T. H. Room 219, Federal Building =17.= EQUATOR CROSSINGS FOR SAILING PASSAGES IN THE PACIFIC OCEAN. This table gives the data for ships north bound in the Pacific from Cape Horn or west coast of South America, for the United States.