Whether or not the nervous system, which is the connective tissue between man's animality and his intellectuality, transmits its subtle forces from one generation to another, we may be sure that the mind acts on the nerves, and the nerves on every part of the system, and that the intelligence of the mind influences and governs the materialism of the body, and the consequences in some way are felt by succeeding generations; but that the mind becomes material, and its qualities transmitted to posterity, is an hypothesis yet unestablished. [Sidenote: IMPROVEMENT PURELY INTELLECTUAL.] Moreover we may safely conclude that the improvement of mankind is a phenomenon purely intellectual. Not that the improvement of the mind is wholly independent of the condition of the body; for, as we shall hereafter see, so intimate is the connection between the mind and the body, that the first step toward intellectual advancement cannot be taken until the demands of the body are satisfied. Nervous phenomena are dependent upon the same nutritive processes that govern physical development; and that this nerve force, through whose agency the system is charged with intellectuality, as the molecule is charged with mechanical force, does exist, is capable, to some extent, of transmitting acquirements or artificial instincts from parent to child, we have every reason to believe; but, so far as we know, intellectual force, _per se_, is no more a transmittable entity than is the flesh-quivering of the slain ox life.