It is to Schüssler that we owe the introduction of this salt into homoeopathy. His account of it is this: "It is contained in nearly all the cells and is chemically related to fibrin. It will dissolve white or greyish-white secretions of the mucous membrane and plastic exudations." This gives the indication for it in catarrhs, in croupous and diphtheritic exudations, and in the second stage of inflammation of serous membranes when the exudation is plastic. "When the cells of the epidermis lose molecules of K. mur. in consequence of a morbid irritation, then the fibrin comes to the surface as a white or whitish-grey mass; when dried this forms a mealy covering. If the irritation has seized upon the tissues under the epidermis, then fibrin and serum are exuded, causing the affected spot on the epidermis to rise in blisters. Similar processes may take place in and below epithelial cells." These are practically the whole of the cardinal indications in which K. mur. has been prescribed. On these indications it has been extensively used by homoeopaths, but I am not aware of any proving having been made. Boericke and Dewey, in their standard work on the Tissue Remedies, give a schema of "guiding symptoms," but these consist in great part of names of pathological states. They contain, however, valuable indications, and I am indebted to these authors for my Schema. The conditions and symptoms most strongly emphasised are: Chronic catarrhal condition of middle ear. Closed Eustachian tubes. Snapping and noises in the ear. Greyish-white, dryish or slimy tongue. Haemorrhoids, bleeding, blood dark, fibrous, clotted. Diphtheria. Rheumatic fever with exudation and swelling around the joints. The symptoms are < by motion, and < by any fatty or rich food or pastry. < By warmth of bed (rheumatic symptoms). It is said to have cured cataract after Calc. fl. had helped. I have cured with it rheumatism affecting most left shoulder and elbow, < in morning on rising. K. mur. manifests the action of its two elements in about equal proportions. It compares closely with K. chlor., and it is quite possible that the proving of the latter will be available for both preparations, as Hering infers. Among the symptoms of K. chl. are: "Tendency to rush of blood to both eyes" and "Light before both eyes on coughing and sneezing." Boericke and Dewey give: "Protruded appearance of eyes, white tongue, croupy, hard cough, harsh barking." Hering gives: "Cough, stomachy, noisy, with protruded appearance of eyes." To which preparation this last belongs I cannot say; but in a case of mine K. mur. caused a severe aggravation of the following: "As if eyes would be forced out of head, with cough." I conclude, therefore, that "cough affecting the eyes" is common to K. chl. and K. mur. The great keynote of K. mur. is, whiteness—whiteness of secretions, exudations, eruptions of tissues. The next is, toughness—fibrinous exudations and discharges, too readily clotting blood-hence embolism, indurations, hard swellings. In H. R., xv. 341, is an incidental proving of K. mur. by "J. De W. C." I have included his symptoms and marked them "(C)." They are mostly in the throat.