A Spanish naval surgeon, Don Anton Jurado, while serving on board the gunboat Magallanes had an opportunity of proving Poey's statement that the fishes caught on the coast of Cuba are often very poisonous. No less than twenty-seven of the officers and men were taken ill, most of them with gastro-intestinal disturbance of a more or less severe nature; the others suffered from nervous symptoms. The horse mackerel, green cavalla, and the jack are often found most unwholesome when caught in West Indian waters. In Barbados a whole family were seized with symptoms simulating cholera from eating "green cavalla." The editor of The Barbadian writes: "We think it right to caution people against the fish called 'green cavalla' from being purchased by their cooks. Some years ago we know that several individuals were extremely ill from eating this fish, which is frequently very poisonous. The night before last a whole family in Bridgetown, except the master, who fortunately had dined out, were seized with violent cholera after having partaken of cavalla." The "jack" (_Caran plumieri_) is found to be poisonous in some seasons of the year, and it is said that at such times two small red lumps appear in its gills. When they are suspected of being in a poisonous condition an experiment is tried upon a duck by giving her one of them to swallow, and if at that season it is poisonous the duck dies in about two hours. The "rock hind," or "smoky hind," after attaining a certain size becomes most unwholesome, and often infested with parasites. Numerous instances of severe symptoms attacking persons after eating this fish are recorded. Toadfish, or _Tetrodons_, are occasionally met with, and are to be avoided as being extremely poisonous, especially if the roe or liver be eaten. A family of coolies in Trinidad, in spite of being warned, ate one of these fishes, with a fatal result. The symptoms were blunted sensibility, trembling, general muscular weakness, difficulty of breathing, vomiting of blood, convulsions, and death. The _Diodonts_, "trunkfishes," are not nearly so poisonous as the _Tetrodonts_, but they are found to be very noxious at certain times or in certain localities, more especially if the gall bladder, liver, and intestines are not removed before cooking. It is reported that those persons who had eaten them suffered from loss of sensibility, cold sweat over the whole body, and stiffened limbs. Death followed in some cases. The "prickly bottle fish" (_Diodon orbicularis_), met with in the Gulf of Mexico, is said to be injurious when eaten.