Archives of internal medicine . xid per 10,000. It seems clear that the average ventilation of the THOMAS R. CROWDER IK lower berth in this type of car is on the average slightly better than theupper, but the difference is so small as to be of no practical a general way it is found that the average of the berths and of theaisle follow each other consistently. Both vary from time to time in away that can be only theoretically explained, and an individual berth mayshow great irregularity. Chart 7 shows the variations through two of thelonger series (Series 96 and 99, Cars 38 and 4
Archives of internal medicine . xid per 10,000. It seems clear that the average ventilation of the THOMAS R. CROWDER IK lower berth in this type of car is on the average slightly better than theupper, but the difference is so small as to be of no practical a general way it is found that the average of the berths and of theaisle follow each other consistently. Both vary from time to time in away that can be only theoretically explained, and an individual berth mayshow great irregularity. Chart 7 shows the variations through two of thelonger series (Series 96 and 99, Cars 38 and 40 for lowers and 1 and 2for uppers in Table 8), and will serve to render clear the manner of mak-ing up the details of the tables. The determinations made at 12 :45 a. the car Oswego were from samples collected just after a five-minutestop. The effect of such a stop is almost invariably shown by a similarrise of the carbon dioxid. The averages for the series represented inleft part of Chart 7 are among the lowest Chart 7. In a few instances samples were taken simultaneously in two carsof the same train, both being equipped with exhaust ventilators. Such acondition is represented in Chart 8 (Series 78 and 79, Cars 32 and 33 ofTable 8), where it is seen that the average carbon dioxid for both berthsand aisles of the two cars show only a fractional difference. If we bring into comparison the conditions of the two classes of cars,those without and those with the exhaust ventilators, a decided advantageis seen to lie with the latter in the study of berth conditions, as was beforenoted in the study of air from the car body. This comparison is graphic-ally represented for the general averages of the lower berths and the aislesin Chart 9, and an equivalent for the upper berths of all the ears repre- 114 TEE ARCEITES OF INTERNAL MEDICINE sented in Tables 6 and 8 is computed from the ratios between lower andupper berths established from the comparisons made in Tables 7 an
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