It is in the correction of chronic pathological conditions, that iodine therapy finds its greatest field in the practice of veterinary medicine and surgery. It is in chronic pathological conditions, that iodine, in various forms, and with various modes of application, so forcibly demonstrates its therapeutic work, for it is here that iodine is often the only agent used in the handling of the case, thus constituting the entire treatment. Under these circumstances, it is never a difficult matter to decide as to the value of the treatment or the activity of the agent used. Were there no other means of demonstrating the fact that iodine, in some of its forms, arouses the animal organism to the end, and in the direction, of marked efforts at regional cure of various pathological states, we would have evidence of ample weight to convince us of this in the results that we daily get with its application in a general practice. There is hardly any therapeutic result from which the practising veterinarian derives more professional satisfaction than he does from the sure, gradual effect of properly selected and correctly applied iodine preparations in chronic pathological conditions of the articulations, from the speedy and specific effect of others in certain skin diseases, and from the almost miraculous cure of certain localized infections when the proper iodine medication is applied in these. So sure are the effects of iodine, in a curative way, in certain diseased conditions among domestic animals, that it has value in this regard from a diagnostic standpoint. Given a case apparently of this type for handling, the practitioner can be assured that he has erred in his diagnosis if iodine, in proper preparation and correct application, does not effect a cure. To illustrate this, I need only refer to that diseased condition of the skin commonly termed “ring worm.” It is nothing unusual, in a veterinary practice, to see the curative effects of iodine applications demonstrated in certain chronic conditions, of the articulations for instance, after various other means of handling, even including surgical interference, had failed to effect the desired result. In not a few of such conditions, iodine applications, in some form, are prescribed as a sort of “last resort” treatment, even against the hopes of either client or practitioner, for the accomplishment of anything in the way of benefit.