VOL. 4 (1950) 



BODY SIZE AND TISSUE RESPIRATION 



261 



TABLE VI (continued) 



TABLE VII 



AVERAGE Q02 OF BRAIN CORTEX AND LIVER OF 9 MAMMALIAN SPECIES COMPARED WITH AVERAGE 

 BASAL HEAT PRODUCTION (Qq^ MEASURED IN MEDIUM III) 



(The average Q02 values are computed from Table VI. The average basal heat production is taken 

 from Benedict's*^ graphs 



4. Qq^ in saline serum substitute {medium I) 



In order to decide whether the difference between the Q02 values obtained for brain 

 and liver in media II and III were due to the differences in the calcium content, or in 

 the bicarbonate and phosphate content, comparative measurements were made on the 

 same tissue sample in media I, II and III. The 'indirect' method of Warburg^^ was used 

 for the measurements in medium I, in preference to those of Dickens and Simer" or 

 Dixon and Keilin^^, because with this method it is possible to follow the time course 

 of the oxygen uptake. Duplicate sets of vessels were used in each measurement. Q02 was 

 again calculated for the 15 to 60 min period of incubation. The results of the comparative 

 measurements are given in Table VIII. 

 References p. 26y~26g. 



