The Mandingoes seldom attain extreme old age. At forty, most of them become gray haired, and covered with wrinkles; and but few of them survive the age of fifty-five or sixty. They calculate the years of their lives, as I have already observed, by the number of rainy seasons, (there being but one such in the year,) and distinguish each year by a particular name, founded on some remarkable occurrence which happened in that year. Thus they say the year of the _Farbanna war_; the year of the _Kaarta war_; the year on which _Gadou was plundered_, &c. &c.; and I have no doubt that the year 1796 will in many places be distinguished by the name of _Tobaubo tambi sang_, "the year the white man passed;" as such an occurrence would naturally form an epoch in their traditional history.
But notwithstanding that longevity is uncommon among them, it appeared to me, that their diseases are but few in number. Their simple diet, and active way of life, preserve them from many of those disorders which embitter the days of luxury and idleness. Fevers and fluxes are the most common, and the most fatal. For these, they generally apply saphies to different parts of the body, and perform a great many other superstitious ceremonies; some of which are, indeed, well calculated to inspire the patient with the hope of recovery, and divert his mind from brooding over his own danger. But I have sometimes observed among them a more systematic mode of treatment. On the first attack of a fever, when the patient complains of cold, he is frequently placed in a sort of vapour. This is done by spreading branches of the _nauclea orientalis_ upon hot wood embers, and laying the patient upon them, wrapped up in a large cotton cloth. Water is then sprinkled upon the branches, which descending to the hot embers, soon covers the patient with a cloud of vapour, in which he is allowed to remain until the embers are almost extinguished. This practice commonly produces a profuse perspiration, and wonderfully relieves the sufferer.
For the dysentery, they use the bark of different trees reduced to powder; and mixed with the patient's food; but this practice is in general very unsuccessful.
The other diseases which prevail among the Negroes are the _yaws_, the _elephantiasis_, and a _leprosy_ of the very worst kind. This last mentioned complaint appears, at the beginning, in scurfy spots upon different parts of the body, which finally settle upon the hands or feet, where the skin becomes withered, and cracks in many places. At length, the ends of the fingers swell and ulcerate, the discharge is acrid and foetid; the nails drop off, and the bones of the fingers become carious, and separate at the joints. In this manner the disease continues to spread, frequently until the patient loses all his fingers and toes. Even the hands and feet are sometimes destroyed by this inveterate malady, to which the Negroes give the name of _balla jou_, "incurable."