(A very complete proving of this remedy will be found in Allen's _Encyclopædia of Pure Materia Medica_, but little use seems to have been made of it, though the following by Dr. Tybel-Aschersleben, _Allgemeine Hom. Zeitung_, March 13, 1890, seems to show that it is very efficient in certain forms of rheumatism.) We are by no means rich in remedies against arthritic rheumatism, and those which we do use lack the reputation of being reliable. A new and a valuable remedy will therefore be a welcome addition to this list. I say reliable, inasmuch as this remedy is truly homoeopathically indicated for, according to Foster, of Leitz, Niemeyer's Pathology, 10th edition, 2d vol., pp. 561: "_Lactic acid in large doses and used for a long time will produce symptoms entirely analogous to arthritic rheumatism_." We also find mention elsewhere that the use of lactic acid occasioned rheumatic pains in the thigh. CLINICAL CASES. 1. A young girl æt. 15 was afflicted with acute arthritic rheumatism, she received _Acid Lacticum_ 2x dil., a dose every 2 or 3 hours, and was so much improved in two weeks that the pain had subsided, and for her remaining weakness _China off._ sufficed. 2. A nine-year-old girl was confined to her bed for three weeks with acute arthritic rheumatism. _Acid Lacticum 2_ speedily cured her. 3. A miner, B., had been afflicted over six weeks with acute arthritic rheumatism. The first dose of _Acid Lactic 2_ gave relief and a second dose cured the man. 4. In a case with swollen and very painful joints one dose of _Acidum Lactic 2_ sufficed to overcome the pain and the swelling. Against the remaining weakness _China_ proved efficacious. 5. Arthritic rheumatism of the wrist vanished slowly after using _Acid Lactic 2_ from two to three weeks. 6. A patient afflicted with arthritic rheumatism for four weeks, accompanied by copious perspiration, soon mended under the use of _Acid Lactic 2_ and was entirely cured within two weeks. 7. Even in a case of chronic arthritis with inflation of the Epiphyses of Metacarpal bones and consequent partial displacement of the fingers, _Lactic Acid 2_ produced such a decided amelioration that two months later the report said: all pains are gone even the anchylosis has disappeared. (It has also been successfully employed in cases where the digestive powers are weak and is said to be preferable to other acids in such cases. It has also been successfully employed in cases of dyspepsia.) ÆTHIOPS ANTIMONIALIS. (This remedy is prepared by triturating together equal parts of _Æthiops mineralis_ and _Antimonium crudum_; we may add that the first named consists of a trituration of equal parts of _Mercurius viv._ and washed flowers of sulphur. Therefore _Æthiops antimon._ consists of mercury, crude antimony and sulphur.