To the Editor:—A mistake in my "Handbook of Ocular Therapeutics" has come to my attention, and I should very much appreciate. it if the following note of correction could be published in the Archives. On page 69, in the table for dosage of old tuberculin, doses nos. 33 to 36 are given as .2 to .5 cc. of concentrated old tuberculin. This would be taken to mean the original pure old tuberculin and would, of course, mean a much larger dose than the one desired. In cases which require doses over 1 mg., a special dilution must be made up containing 0.1 cc. of concentrated old tuberculin to 10 cc. of physiologic solution of sodium chloride. Of this, 0.1 cc. equals 1 mg. of tuberculin and doses nos. 33 and 36 should be 0.2 cc., 0.3 cc., 0.4 cc. and 0.5 cc. of this dilution. The other statements