can come of men who know all that scienco can teach of the nature of diphtheria on the one hand, and of the properties, of sul phuric acid on the other, condescending to give their attention to it, so far at least as to satisfy themselves and others, how far there i 3 or is not ground for reasonable belief in the efficacy of the latter as a cure for the former. This done, the question of testing in actual practice might safely he left to the wisdom of the profession, and the common sense and parental instincts of the pa rents of the victims. Whether "true diphtheria" is quite such a " happy rarity" amongst us, as our correspondent seems to believe, we know not, but we do know that something very much like it, which, moreover, has been said to be diphtheria by the medical attendants, and treated accordingly, has often been anything but a "rarity," and proved itself to be any thing but "happy" in its results upon many a settler's home. It was a knowledge of this fact that led to our making the suggestion we did ; and if nothing better even than our correspondent'sletter comes of it, we shall feel satisfied that good and acceptable service has been done.
