During our six-day stay at Cartagena, our most interesting excursions were to the Boca Grande and the Popa hill with its fine view. The port, or bahía, is 9. miles long. The unhealthiness of Cartagena comes from the great marshes surrounding the town on the east and north. The Ciénaga de Tesca is more than 15 miles long. A sad vegetation of cactus, Jatropha gossypifolia, croton and mimosa covers the arid slopes of Cerro de la Popa. While botanizing on these wild spots our guides pointed out a thick Acacia cornigera bush infamous for a deplorable event. This acacia is armed with very sharp thorns, and extraordinarily large ants live on it. A woman, annoyed by her husband's well-founded jealousy, planned a barbarous revenge. With the help of her lover she tied her husband up with rope, and at night chucked him into this Acacia cornigera bush. The more violently he struggled the more the sharp thorns tore his skin. His screams were heard by some passers-by who found him after several hours covered with blood and dreadfully stung by ants. This crime is without example in the history of human perversion; the violence of its passion derives from the coarseness of manners, not from the Tropics. My most important work at Cartagena was comparing my observations with the astronomical positions fixed by Fidalgo's officers.