The idiopathic inflammation of the laryngeal cartilages is considered a rare affection by the greater part of the authors; who instead affirm that the laryngeal perichondritis and chondritis, as manifestations of certain constitutional illnesses, pocken, typhoid fever, syphilis, lupus, cancer, tuberculosis and mercurial intoxication, are sicknesses which are observed frequently. I think that the idiopathic perichondritis appears many or more times than the symptomatic, and if we do not take notice of it with more attention, it is because it terminates generally by resolution, and passes without being noticed, and we believe it to be an inflammation limited to the mucous membrane, and to the immediately sub mucous tissue, which penetrates into the same cartilage. For which it is called intense inflammation of the arytenoid mucous membrane, that which not only invades the immediately submucous tissue, but that which reaches the crico-arytenoid articulation, beginning in many cases the phlogosis by