The most celebrated mineral springs in Cuba are to be found at San Diego, where there are hot sulphur waters, springs bubbling ceaselessly from the earth, and for which great virtues are claimed. The springs are situated west of Havana, between thirty and forty leagues, at the base of the southern slope of the mountains. These waters are freely drank, as well as bathed in, and are highly charged with sulphureted hydrogen, and contain sulphate of lime and carbonate of magnesia. There are some diseases of women for which the San Diego waters are considered to be a specific, and remarkable cures are authenticated. Rheumatism and skin diseases are specially treated by the local physician. There is a very fair hotel at San Diego, located near the baths, and many Americans speak warmly in praise of the place as a health resort. Next to the springs of San Diego, those of Madruga are notable, situated between Matanzas and Havana, and which can be reached by rail. The character of these springs is very similar to those of San Diego, though of lower temperature. They are used both for bathing and for drinking. Madruga is more easily accessible from the metropolis than is San Diego. There is also a good physician resident in the village. CHAPTER X. The Fish-Market of Havana. -- The Dying Dolphin. -- Tax upon the Trade. -- Extraordinary Monopoly. -- Harbor Boats. -- A Story about Marti, the Ex-Smuggler. -- King of the Isle of Pines. -- The Offered Reward. -- Sentinels in the Plaza de Armas. -- The Governor General and the Intruder. -- "I am Captain Marti!" -- The Betrayal. -- The Ex-Smuggler as Pilot. -- The Pardon and the Reward. -- Tacon's Stewardship and Official Career. -- Monopoly of Theatricals. -- A Negro Festival. The fish-market of Havana doubtless affords the best variety and quality of this article to be found in any city of the world, not even excepting Madras and Bombay, where the Indian Ocean and the Bay of Bengal enter into rivalry with each other as to their products. The scientist Poey gives a list of six hundred species of fishes indigenous to the shores of Cuba. The supply of the city is not only procured from the neighboring waters, but fishermen come regularly a distance of over a hundred miles to the ports of the island, from Florida and Yucatan, with their small cutters well loaded. It was through the means afforded by these fishing crafts that communication was kept up between the Cuban patriots at Key West and their friends on the island, and no doubt smuggling was also carried on by them, until they came under the strict surveillance of the revenue officers.