Faraday discovered that other solid substances besides glass exert a similar action on a beam of polarized light. Even opaque solids like iron possess this property. Kerr has proved that a beam of light passed through an extremely thin plate of highly magnetic iron has its plane of polarization slightly rotated.

But alas for our mechanical model consisting of the cloud of little elastic solids flying about among one another. Though each particle have absolutely perfect elasticity, the end must be pretty much the same as if it were but imperfectly elastic.

I. 47 that the square on the hypotenuse of any right-angled triangle is equal to the sum of the squares on the other two sides. But Proclus also attributes to him, besides the theory of proportionals, the construction of the 'cosmic figures', the five regular solids. This method was fully worked out by the Pythagoreans and proved one of the most powerful in all Greek geometry.

But we see, that if one drop of water be united with another, they form one large drop, as spherical as either of the two which composed it: and on the separation of the moon from the earth, if they were composed of mingled solids and fluids, or if the solid parts rested on fluid, both the fragment and the remaining earth would assume the same globular appearance they now present.

When we pass in review the intellectual functions, we see that the intellect is never quite at its ease, never entirely at home, except when it is working upon inert matter, more particularly upon solids. What is the most general property of the material world? It is extended: it presents to us objects external to other objects, and, in these objects, parts external to parts.

Indeed, the air during the rainy season is so loaded with moisture that clothes, shoes, trunks, and everything that is not close to the fire becomes damp and mouldy, and the inhabitants may be said to live in a sort of vapour-bath; but this dry wind braces up the solids, which were before relaxed, gives a cheerful flow of spirits, and is even pleasant to respiration.

The cohesive power of liquids is overcome by heat as well as that of solids, only to a much greater degree, for under it they assume a new form, acquire new properties, and expand immensely in volume. They pass into the form of vapour, occupy a thousand times larger area, and possess an elasticity of compressibility and expansibility they were destitute of before.

They consist of thirteen books, the first four on plane geometry; the fifth is on the theory of proportion, and applies to magnitude in general; the seventh, eighth, and ninth are on arithmetic; the tenth on the arithmetical characteristics of the division of a straight line; the eleventh and twelfth on the elements of solid geometry; the thirteenth on the regular solids.

If the symptoms are extreme, are perceived as overwhelming or are actually life-threatening, detoxification can be speeded up by dropping back to only dilute raw juices or vegetable broth made only from greens, without eating the solids. In the most extreme cases hygienists use their most powerful medicine: a long fast on herb teas, or just water. I will have a lot to say about fasting, later.

The work explains in clear and simple style how these extraordinary pictures are taken through solids. Full description is given of the apparatus used, and the text is profusely illustrated with half tone illustrations giving fac-simile copies of the pictures taken from the negatives of the author. The subjects are varied.