In attempting to arrive at a correct estimate of the x-ray as a therapeutic agent we are confronted at the outset with a number of difficulties: (1) By the fact that this force has been known but a short time and that little is known of its exact nature, so limited is our knowledge that we can not even measure with any degree of accuracy the amount which we are employing in a given case. (2) The agent has been employed but a very short time as a therapeutic agent, and sufficient time has not elapsed to enable us to determine the permanency of the results obtained. (3) Although an enormous amount of work has been devoted to the subject and an enormous number and variety of cases have been treated during the last three years, still for the most part this has been done in a haphazard way by
BEVAN AD. THE X-RAY AS A THERAPEUTIC AGENTWITH ESPECIAL REFERENCE TO CARCINOMA. JAMA. 1904;XLII(1):26–30. doi:10.1001/jama.1904.92490460005001g
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