I assume that no apology is necessary for my changing the subject of this paper from the Surgical Treatment of Lung Cavities to the discussion of Koch's lymph; because of late my mind and opportunities have been turned in the latter direction. Besides, my professional brothers expect some report of my investigations of the great German scientist's new remedy, and now and here are the best time and place for it. Now, because time enough has elapsed for the expression of a great variety of opinions, and here, because no symposium on consumption is complete without a consideration of this recent invention for its amelioration.
The questions which to my mind need most to be answered are,
1. Was the description given us of the composition of Koch's lymph sufficient for our gaining full knowledge as to its uses?
2. Were the rules laid down by the author adequate and