In the prehistoric stages of our development, while pure physicality dominated us, we asserted our supremacy by superior strength or speed. Further along a cunning mentality gave us a wider range of power. Still later we have grown into wisdom, and as we near the end we shall discard all the physical desires, the tastes and appetites, the hopes and ambitions, the affections and passions that tie us to the earth life, and take on instead the finer spiritual attributes that are inseparable from the higher planes of existence. The severing of the earth desires marks the end of the process of evolution of spirit from matter. What follows that we may infer from analogy. The process of unfolding doubtless continues on planes of which we have no conception, but obviously need not dread to encounter. Of course we have moved slowly forward in our various stages of development from whatever we were before we took on human qualities up to our present degree of attainment. It is not hard to believe that we have developed superior understanding and the other higher attributes of humanity only as our growing needs and opening opportunities have called for them. The evolution of species and the laws governing the development of physical organs as they became necessary for the growth and preservation of the infinite variety of living things have been a favorite study for materialistic scientists for the past century. More than that, long ago the learned Jean Baptiste Lamarck formulated four propositions that are now accepted as self-evident. First. Life, by its proper forces, tends continually to increase the volume of every body possessing it, and to enlarge its parts up to a limit which it brings about. This covers the phenomenon of growth to maturity. Second. The production of a new organ in an animal body results from the supervention of a new want continuing to make itself felt, and a new movement which this want gives birth to and encourages. This is shown in the long neck of the giraffe, which enables him to feed on the tender top leaves of tall tropical plants, and in the camel's hump which supplies him with vigor during long intervals without feeding, and the receptacle for water, which enables him to traverse long stretches of barren and streamless lands. Third. The development of organs and their force of action are constantly in ratio to the employment of those organs. The kangaroo, a large animal carrying its young for safety in a natural pouch, stands erect and never uses its fore legs in walking. It leaps forward in prodigious bounds, propelled by the muscular power of its tail, which has grown and developed beyond even the hind legs in strength; while the fore legs have dwindled to insignificant size and importance.