It appears from despatches furnished by the United States Minister at Buenos Ayres, and published in the weekly abstract of sanitary reports issued from the office of the Supervising Surgeon-General of the U. S. Marine Hospital Service, Washington, D. C., January 27, 1887, that about the first of November, 1886, the Italian ship "Perseo," plying between Genoa and Buenos Ayres, arrived at the latter place infected with cholera, several deaths from the disease having occurred during the voyage. Before the facts were made known, the ship had landed many passengers at the Boca, a low, filthy dock below the level of the river Platte, and then proceeded to Rosario, on the Pasaka river, 200 miles distant, where she discharged the remainder of her passengers and cargo. Cases of cholera occurred soon after the landing of the ship "Perseo," both at the Boca port and at Rosario, and continued to spread