TABLE I B.-Effects of resting one hour in moving air at 95° wet bulb, 95° dry bulb (100 per cent relative humidity).

Data taken in the same place as for the 95° still air (Table I B), but with the use of the small fan to give motion to the air, 95° saturated; subject No. 2 sitting in air with velocity about 500 linear feet per minute as measured by an anemometer, subject No. 4 in a velocity of 250 to 300 feet, and subject No. 5 in a velocity of about 600 feet, show that the body temperature and pulse rate of the three subjects were scarcely affected, and, although all perspired some, there was no excessive perspiration and parts of the clothing remained dry. There was little or no dizziness experienced during the test or afterwards; no "panting" or "puffing," and no weakness. In fact, all subjects felt comparatively comfortable in this moving, saturated air at 95° F. (subject No. 2 felt that he could work fairly efficiently in it). On the other hand, all felt decidedly ill and uncomfortable in the same air when it was still, and all knew definitely that very little work could be done in the stagnant air. Figure 1 shows the decided difference in favor of moving 95° saturated air, as compared with the same air when still, as indicated by the effect on the body temperature of subject No. 5.

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TABLE II B.-Effects of resting one hour in moving air at 96° wet bulb, 96° dry bulb (100 per cent relative humidity.)

The results on the subjects with moving 96° saturated air (Table II B), using the small fan, are described below. Subject No. 2 sat in this hot, humid air that was moving at a velocity of about 300 feet per minute; and, while perspiration was profuse, saturating clothing and even shoes, no "panting" or dizziness occurred and no headache was felt as when in still air of the same temperature, and little or no weakness was felt when the test was over. Subject No. 4 sat for an hour in 96° saturated air having a velocity of about 300 feet per minute and, although perspiring freely, did not have shoes partly filled with perspiration as occurred in the same air when there was no movement. In this test subject No. 4 also escaped the headache, dizziness, and "panting" which he experienced at the same temperature in still air. The table shows definitely less change in body temperature and pulse rate of subject No. 4 with the moving air than with the still 96° saturated air, though the other conditions as to air quality, effort exerted, etc., were essentially the same in both tests. On subject No. 5, the effect of sitting an hour in 96°saturated air moving at the rate of 100 to 200 linear feet per minute. is not in agreement with the effect on subjects Nos. 2 and 4 in air of the same temperature and humidity, but moving about 300 linear feet per minute. Subject No. 5 had exerted physical force to a certain extent for about 15 minutes trying to set the 50-pound fan for the test, and had somewhat increased his body temperature when, with the others, he entered the moving 96°-saturated air and sat down for the hour test. While subjects Nos. 2 and 4 had no headache, dizziness, or "puffing" in the moving air, subject No. 5, on this date, "puffed" a little on standing up, and, in addition to having his clothing saturated with perspiration (as did subjects Nos. 2 and 4), also had his shoes partly filled with perspiration (although subjects Nos. 2 and 4 were not thus affected). Subject No. 5 reported that this experience was much more difficult to endure than any of the other tests; but subjects Nos. 2 and 4 felt that it was not nearly as severe as those in still, saturated air. It is probable that the comparatively small amount of work done in setting the fan was responsible for the difficulty experienced by subject No. 5 in enduring the test condition on this occasion.

All sweating profusely. Nos. 4 and 5 felt fine;
dizzy.
No. 1 all right; No. 2 a little warm but not
No. 2 hot when standing up to take tempera-
ture. No. 5 0. K., but sweating freely, al-
though hair on top of head just getting wet.
No. I feeling well, but "nothing wonderful."
No. 4 felt 0. K., skin a little hot, hair not wet
yet; would have had difficulty in breathing
if he had exerted himself even a little; same
was true of others to less extent. There was
running water on the floor at a temperature
of 100°, and "drippers" all around with a
temperature of 98°-102°, and the air was abso-
lutely saturated.
101.3 146 All were perspiring very freely. No. 2 was not
dizzy, but didn't feel very good. No. 5 was
dizzy on slight movement, face flushed, and
perspiring very freely. No. 1 not feeling very
well, and dizzy on slight movement. No. 4
O. K., but skin hot; hair not yet wet.
No. 5 stated that he could easily work 6 hours
out of an 8-hour shift in 95-95 moving air,
but would not care to work so hard in mov-
ing air at 981-981°. No. 2 thought that half
time in 95-95° moving air could be easily
done, but that not more than one-fourth
981-981
time (2 hours out of 8) could be done at