THE INFLUENCE OF PHYSICAL FACTORS 



TABLE XII. RESPIRATORY EXCHANGE PER KILOGRAM AND HOUR. 



The individual results obtained by Vernon on various marine 

 animals are in most cases rather discordant. Vernon has summarized 

 them in the table in which the respiratory exchange of each form at 

 1 6^ has been taken as unity. Vernon denotes as the temperature in- 

 crement the ratio between the respiratory exchange at 24 and at 10. 

 This figure is given in the last column. It is high (5 to 3) for hyaline 

 pelagic animals such as Beroe, Cestus or the Salps, while animals, which 

 are not pelagic and opaque or only slightly transparent, have low tem- 

 perature increments. 



Montuori [1913] made determinations of |-hour duration at about 

 22 on various marine animals, and thereafter on each a series of 

 ^-hour experiments with 20 min. intervals at about 32. He found in 

 all cases an increase during the first half hour at the high temperature, 

 but the respiratory exchange then fell off gradually and after twenty- 

 four to twenty-eight hours regained its normal level or became lower. 

 His results are, like Vernon's, very irregular individually. 



