The animal life of the Isthmus is not abundant, although some deer and a few tapirs are to be found. Alligators abound in the Chagres River and other streams of the Zone. Perhaps the most interesting form of animal life to be found on the Isthmus is the leaf-cutting ant. This ant seems to be nature's original fungus grower. As one walks around the American settlements, he frequently comes upon a long path filled with ants, passing back and forth. They resemble a sort of miniature yacht under full sail, except that the sails are green instead of white. Upon closer examination it is found that what seemed to be a sail is a triangular piece of leaf carried on the back of the ant, with its edges to the wind so as to overcome air resistance. The ants do not gather these leaves for food, but they store them in such a way that a fungus grows upon them. They eat the fungus, and when the leaves are no longer useful they are thrown out and new supplies brought in. The native remedies used by the Panamans are many and interesting. For stomach troubles, which are very rare, they eat papaya. The papaya is a sort of fruit which might be a cross between a cantaloupe, a watermelon and a pumpkin, except that it grows on trees. It has the rind of a green pumpkin, the meat of a cantaloupe, and the seeds of a watermelon. It is probably richer in vegetable pepsin than any other plant in existence--a pepsin which neutralizes either alkaline or acid conditions in the stomach. It is said that a tough steak, wrapped in the leaf of the papaya tree overnight, becomes tender as the result of the digestive action of the pepsin in it. The Indians and Panamans who live in the jungle use the wood of the cacique, or "monkey cocoanut," to stop any flow of blood. In their materia medica they have a large number of tropical plants which they use for their ailments. The way in which sanitary instruction may be made efficient is illustrated among some of the people of Panama. Upon one occasion the Canal Record carried a small diagram of how to make a sanitary drinking cup out of a sheet of paper. After that there were many Panamans who, although in a hundred ways indifferent to contagion, would no longer drink from common drinking cups, but would make their own sanitary cups. Even the Jamaican negroes employed around the offices of the commission in many instances would not think of using the common drinking glass at the office water-cooler. Two tribes of Indians on the Isthmus have not mixed with the Caucasians or the negroes. They are the Chucunoques and the San Blas Indians. The latter tribe has never been known to allow a white man to remain in its territory after sundown. Even the higher officials of the Panaman Government are forced to respect this tradition when they treat with the San Blas chiefs.