Q. May I ask you what fields within aviation medicine you have worked on specifically, because my clients, who are recognized specialists in this field, attach importance to ascertaining precisely what fields you have worked in particularly? A. I have worked particularly in the field of decompression or pressure drop sickness, and I have also worked in the field of anoxia or exposure to altitude repeatedly at a level of 18,000 feet to ascertain if that has any effect in the causation of pilots’ fatigue. Q. At what time did you specifically concern yourself with the fields you have just named? Was that before the Second World War, during the Second World War, or was it earlier than that? A. My interest in these fields of aviation medicine, including free fall which I did not mention, started in 1939. Q. Regarding your specific work in this field, Witness, you have also issued publications. I believe you spoke of two publications. Did I understand you correctly, or were there more? A. There were two in the field of decompression sickness. There was one publication in the field of the effects of repeated exposure to a mild degree of oxygen lack. My other work has not yet been published but was submitted in the form of reports to the Committee on Aviation Medicine of the National Research Council of the United States. Q. When were these two papers published of which you just told us; when, and were they printed by a publishing house? Did they appear in a journal or a periodical? A. One appears in the Journal of Aviation Medicine either in September or October of 1946. The other appears in the Journal of the American Medical Association in either December or January 1946 or 1947. The publication on the effect of repeated exposure to mild degrees of oxygen lack at altitude appears in the quarterly bulletin of Northwestern University Medical School and part of the work, insofar as its effect on the elimination of the basis in the urine is concerned, appeared in the Journal of Biological Chemistry around 1944 or 1945, I am not sure of that date. Q. Theretofore, Witness, you had thus made no publication in the field of aviation medicine before the papers of which you just gave the dates of publication? A. The question is not clear. Q. You just gave us the titles of the publications you have published and when; now I ask whether before the dates you just gave, you did not have any publications in the field of aviation medicine? A. No. My first research started in 1939. Q. You, yourself, have carried out experiments too; is that not so? A. Yes. Q. With human experimental subjects, of course? A. Yes, and on myself. Q. And with a low pressure chamber? A. Yes. Q. Were these frequent experiments, or were the experiments in which you, yourself, took part only infrequent in number? A. The experiments in which I took part were infrequent in number compared to the total number of experiments which I performed.