The nature and causes of impotence in men, and barrenness in women, explained. With the methods by which it may be known in any case, on whose part the imperfection lies; and instructions for the prevention and remedy. Also the consequences of a commerce with eunuchs; and of self-abuse: illustrated with a remarkable case of a widow in the West-Indies: and compleat directions for a lady's managing herself in the nicest article of her health; with innocent and effectual medicines for all the complaints incident to that sex. By G. Archibald Douglas, Doctor of physick.