The crust of the clayish earth is covered with a reddish brown covering of about half a millimeter in thickness. This covering proves to be composed, under the microscope, of cellular filaments and various shaped bodies of various composition. They are made up of cells with densely and coarsely granulated reddish colored contents--shape, size, and composition are very variable. The cellular bodies make up the essential organic part of the clayish substance, and, without any doubt, if anything of the organic compounds of the substance is in genetical connection with the disease, these bodies would have this role. The structure and coloration of cell contents exhibit the closest alliance to the characteristics of the division of Chroolepideæ and of this small division of Chlorophyllaceous Algæ, nearest to Gongrosira--a genus whose five to six species are inhabitants of fresh water, mostly attached to various minute aquatic Algæ and mosses. Each cell of all the plants of this genus produces a large number of mobile cells--zoospores.

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