Some one may think that all this tenuity is as vaporous as the stuff that dreams are made of, and call for solid rocks for foundations.  Perhaps we may so call while we have material bodies of two hundred pounds’ weight.  Yet even these bodies are delicate enough to be valuable to us solely because they have the utmost chemical stability.  We are burning up their substance with every breath in order to have delicacy of feeling and thought.  What were a wooden body worth?  Substances are valuable to us according to their fineness and facility of change.  Even iron is mobile in all its particles.  We call it solid, but it is not.  We lift our eyes from this writing and behold the tumbling surf of the great Pacific sea.  Line after line of its billows are charging on the shore and tumbling in utmost confusion and roar of advancing and refluent waves.  So the iron of the telephone wire.  You often hold the receiver to your ear listening, not to the voice of business or friendship of men, but to the gentle hum of the rolling surf in the wire’s own substance.  And, in order that we may know the essential stability of things that are fine, we are told that the city which hath enduring foundations is in the spirit world, not this kind of material.  The whole new Jerusalem to come down “out of heaven, prepared as a bride adorned for her husband,” is as movable as a train of cars is movable here.  There may still be rainbows and rivers of life if there are no more rocks.  There is a real realm of “scientific imagination.”  But all our imaginings fall far short of realities.  Some men do not desire this realm, and demand solid rocks to walk on.  But a bird does not.  He oars himself along the upper fields and rides on air.  So does a bicyclist and balloonist.  Some men have a sort of contempt for aeronauts and workers at flying machines.  That feeling is a testimony to their depravity and groveling tendencies.  Aeronautics and nautics are an effort toward angelhood.  Men can walk water who are willing to take a boat for an overshoe.  So we may air when we get the right shoe.  Browning gives us a delicious sense of being amphibian as we swim.  And the butterfly, that winged rather than rooted flower, looking down upon us as we float, begets in us a great longing to be polyphibian.  We have innate tendencies toward a life of finer surroundings, and we shall take to them with zest, if we are not too much of the earth earthy.  We were designed for this finer life.  We do take to it even now in the days of our deterioration, not to say depravity.  The great marvels of the world are not so much in matter as in man.  We were meant to be more sensitive to finer influences than we are.  We are far more so than we think.  Take your child into the street.  Another child coughs at a window on the other side, and your child has three months of terrific whooping-cough.  All such diseases are taken by homeopathic doses of the millionth dilution.  Many people feel “in