Under this methodical procedure the relative value of drugs apparently indicated in these diseases gradually became better known; some, although presenting many and varied symptoms, were found by experience to be superficial and evanescent in their action, while others proved of the greatest efficacy in the most serious lesions, and became indispensable in the armamentarium of the physicians of the hospital staff. In the latter group, rhus tox. speedily assumed prominence as a drug of special value in ocular disease, and this was enhanced by such a large measure of success in its application over a wide range of affections that it came to be regarded (at least in this hospital) as a veritable sheet-anchor in ophthalmological work, and as time passed it was used more or less in almost all the acute diseases to which the eye and its adnexa are subject. A prominent symptom of rhus is great swelling of the eyelids. This it has in common with a number of other remedies, but differentiation becomes less difficult when we remember that rhus is specially indicated when swelling and œdema of the lids are the result of the deeper and more serious lesions. After the operation for cataract, one of the first symptoms indicating danger is œdematous swelling of the lids, and no drug in the materia medica compares with rhus for insuring the safety of the eye. When the pathological process becomes advanced, even to the appearance of pus within the eyeball, still we may confidently rely on this remedy, which has cured many such cases when they were apparently hopeless. In all postoperative complications it is of the greatest value, and too much emphasis cannot be placed upon this statement. When a sound eye takes on sympathetic irritation from its diseased fellow, the fact is first manifested by a certain amount of swelling of the lids and more or less profuse lachrymation, the latter another valuable indication for rhus tox. In this condition I have personally used it many times with complete success, and it is the first drug to be thought of in this extremely dangerous complication. It is a well-known fact at the present time that rhus is particularly applicable in rheumatic conditions, especially where these are resultant upon a wetting or exposure to dampness. This, together with its nightly aggravation, points to another sphere of usefulness in rheumatic iritis, where it will prove all-sufficient when the characteristic symptoms exist. In suppurative iritis and cyclitis it is very serviceable, no matter what the cause.