Dancing, is most salutary exercise.- By its mechanical efforts on the body, it inspires the mind with cheerfulness. The music which accompanies it has effects up- on the body as we'll as upon the mind.- It is addressed through the avenue of tho ears to the brain, the common centre of life and motion, whence its oscillations are communicated to every part of the system, imparting to each that equable and uni- form vigor and action upon which the healthy state of all the functions depends. By the power of music, many remarkable cures, particularly of those disorders which are much connected with the nervous sys- tenn. are known to have been performed Dancing should not be used more than once or twice month nor should it ever be continued till weariness comes on nor should the dancer too soon encounter the cold air.--JoMr. of Health.