Silica, Calcium, and Clay, by Dr. Friedrich Benesch and Dr. Klaus WildeSchaumburg Publications
Silica, Calcium, and Clay are the main components of the earth's body. They not only exist as substances but also exert specific effects in the natural realms. In concise essays, Drs. Benesch and Wilde trace the character of these substances as well as their effects in the mineral world, in plants, animals and in man.