the basal heat production of the rhesus monkey (macaca mulatta)

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358 NATHAN RAKIETEN a rotary blower. The outgoing air after passing through two dry gas meters was collected for analysis by the Fox bag method of aliquot sampling (Carpenter and Fox, '31). The samples so obtained were stored in Benedict ( '27) respiration pumps, and then analyzed in the Carpenter ('33) gas analysis apparatus. An activity recorder modified from that described by Benedict and Homans ('12) was used to register the ani mal's movements. Usually aliquots from four to five 20- minute periods were collected and the results of the two periods which gave the best agreement were taken to denote the animal's heat production. The lowest values were chosen in every instance. An agreement of 6 per cent or less was usually obtained for successive periods. Following the ex periences of Bruhn ( '34) the determinations were made at night to facilitate basal conditions. The apparatus was tested intermittently during the investi gation by burning alcohol in the chamber and by analyses of outdoor air. The mean respiratory quotient for alcohol in this series was 0.664 Â±0.003, while the greatest variations from the theoretical respiratory quotient of 0.667 were 0.674 and 0.658. The average results for the outdoor air analyses were 0.032 for C02 and 20.942 for 02. The surface area of the animals was calculated by the method of Lee and Fox ( '33). EESULTS AND DISCUSSION The complete data obtained in these experiments are pre sented in table 1. It was found that the average heat pro duction of the eleven animals was 608 Cai. per square meter per 24 hours. This is approximately 7 per cent lower than the average figures given by Bruhn ( '34) for the four normal animals studied by him. Eight of the eleven animals had metabolic rates that ranged from 586 Cal. to 640 Gal. and the remaining three, numbers 30, 4 and 37, gave values, respec tively, of 543, 543 and 709 Cal. The wide divergences from the mean of these three animals were undoubtedly due to their distinctive metabolic rates. Downloaded from jn.nutrition.org by guest on March 23, 2013
BASAL HEAT OF THE EHESUS MONKEY 359 Animal no. 37 which gave the highest value of the group was extremely excitable and it is conceivable that this high heat production may be accounted for by the emotional dis turbances pointed out by Benedict ('35) and by the cardiac and respiratory factors which have recently been demon strated by Carpenter et al. ( '34) to produce a considerable augmentation in the 02 consumption of normal individuals in the basal state. It is interesting to note that Bruhn ( '34) obtained a value of 701 Cal. on one of the animals in his series. TABLE 1 Results of metabolic rate determinations on eleven rhesus monkeys ANIMAL LITERS/ OÂ»HOURS
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the basal heat production of the rhesus monkey (macaca mulatta)

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