collograph (kolograf)

[ the fact that when a film of moist bichromated gelatin is brought into contact with ferrous salts, tannin, or certain other substances, it acquires the property of attracting a fatty ink. Spon, p. 1609. collogue (ko-lōg'), v.; pret. and pp. collogued, ppr. colloguing. [E. dial. contr. clogue; appar. a modification of * colloque, IMG:content-0810.png:[blocks in formation] party, and tell them his decision, twenty hours before he informs the other. W. Phillips, Speeches, p. 197. II. trans . To wheedle; flatter. They collogue and soothe up their silly auditors. Burton, Anat. of Mel., p. 609. colloid (koloid), a. and n. [ (b) In geol., partly amorphous: applied to minerals. - Col certain irregular of of Lol lobo dies rently the result of the metamorphosis of myelin. - Colloid cancer, or colloid carcinoma, a carcinoma char are bedrop in the sear acterized by the transparency of its ti ues, due to colloid degeneration of its epithelial cells. It is found most frequently in the alimentary canal and mammæ, more rarely in the ovary and elsewhere. - Colloid degeneration, in pathol., the conversion of the substance of a cell into colsoid substance, involving when extreme the destruction of the cell. It occurs in the thyroid gland, in certain tumors, and occasionally elsewhere. - Colloid sphere, a globule with an oily luster, the result of the colloid degeneration of a single cell. - Colloid substance, in pathol., a clear jelly-like substance, firmer and more consistent than mucous substance, soluble in water, not precipitated by acetic acid, and not giving a color with iodine. It arises from colloid degeneration. II. n. A substance in a peculiar state of aggregation characterized by slow diffusibility, permeability by crystalloid solutions, etc. See extract. They are distinguished by the gelatinous character of their hydrates. Although often largely soluble in water, they are held in solution by a most feeble force. They appear singularly inert in the capacity of acids and bases, and in all the ordinary chemical relations. But, on the other hand, their peculiar physical aggregation, with the chemical indifference referred to, appears to be required in substances that can intervene in the organic proce es of life. The plastic elements of the animal body are found in this cla . As gelatine appears to be its type, it is proposed to designate substances of the cla as colloids . J. Graham, Phil. Trans., 1861, p. 183. colloidal (ko-loi'dal), a. [ The gases form colloidal unions with the metals, and are diffused through them just as water is diffused through a jelly. Clerk Maxwell , Heat, p. 259.