Abstract
During the past year or more I have been particularly struck by the divergence of opinion expressed by my dermatologic confrères in New York respecting the value of liquid air in dermatology. In regard to its efficacy in some affections, there seems to be a general unanimity of opinion, while in others our opinions are strikingly at variance. This is the history of almost every new therapeutic agent, especially if it is a little out of the ordinary, and appears to be due, on the one hand, to a difference in the interpretation of its real powers and therapeutic properties and, on the other, to variations in the technic employed. This is the position in which we find the x-ray to-day; there are few who understand it, hence the great difference in the effects produced and the results obtained. Sabouraud can use it in ringworm with a precision and uniform

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