"On this earth there is indeed a tiny corner of the universe accessible to other senses [than the sense of sight]: but feeling and taste act only at those minute distances which separate particles of matter when 'in contact:' smell ranges over, at the utmost, a mile or two, and the greatest distance which sound is ever known to have traveled (when Krakatoa exploded in 1883) is but a few thousand miles--a mere fraction of the earth's girdle."--Prof. H. H. Turner of Oxford. Note 2 (page 27) Huyghens and Leibniz both objected to Newton's inverse square law because it postulated "action at a distance,"--for example, the attractive force of the sun and the earth. This desire for "continuity" in physical laws led to the supposition of an "ether." We may here anticipate and state that the reason which prompted Huyghens to object to Newton's law led Einstein in our own day to raise objections to the "ether" theory. "In the formulation of physical laws, only those things were to be regarded as being in causal connection which were capable of being actually observed." And the "ether" has not been "actually observed." The idea of "continuity" implies distances between adjacent points that are infinitesimal in extent; hence the idea of "continuity" comes in direct opposition with the finite distances of Newton. The statement relating to causal connection--the refusal to accept an "ether" as an absolute base of reference--leads to the principle of the relativity of motion. Note 3 (page 30) Sir Oliver Lodge goes to the extreme of pinning his faith in the reality of this ether rather than in that of matter. Witness the following statement he made recently before a New York audience: "To my mind the ether of space is a substantial reality with extraordinarily perfect properties, with an immense amount of energy stored up in it, with a constitution which we must discover, but a substantial reality far more impressive than that of matter. Empty space, as we call it, is full of ether, but it makes no appeal to our senses. The appearance is as if it were nothing. It is the most important thing in the material universe. I believe that matter is a modification of ether, a very porous substance, a thing more analogous to a cobweb or the Milky Way or something very slight and unsubstantial, as compared to ether." And again: "The properties of ether seem to be perfect. Matter is less so; it has friction and elasticity. No imperfection has been discovered in the ether space. It doesn't wear out; there is no dissipation of energy; there is no friction. Ether is material, yet it is not matter; both are substantial realities in physics, but it is the ether of space that holds things together and acts as a cement. My business is to call attention to the whole world of etherealness of things, and I have made it a subject of thirty years' study, but we must admit that there is no getting hold of ether except indirectly."