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give him the serum," he said. "Yes Doctor" I answered without much of an idea of how that was gong to be done at that hour. "Do you want me to call you after we've seen him?" "Won't be necessary. Just go ahead as fast as you can, and I'll see him in the morning." Only a few minutes later I was called by the supervisor of nurses on the Ninth Floor and told that a patient had just been admitted with a presumptive diagnosis of lobar pneumonia and a temperature of 103o. Lobar pneumonia was destined to be soon struck off the list of the quick killers, but on that evening when as a green intern, I went up to write the admitting note on Mr. C, it headed the list, The Public Health laboratories were open all night and geared to supply and send out serum on request; the physical findings of "consolidation" were drilled into all members of hospital house staffs, and the unpardonable sin consisted in failure to recognize and treat promptly. An elaborate system existed for typing the pneumococcus which, if followed out accurately, gave results much more dramatic than the sulfas