( 52 ) 
It seems to me that we are not entitled to conclude from these 
figures that the 0 2 consumption is proportional to the surface. 
Tables I and II only prove that the small Scyllium consume more 
O t than the big ones and that, calculated for the weight, this 
difference is most considerable with the smallest animals, without, 
however, reaching such a value as to become proportional to the area. 
As to t]ie cause of the greater intensity of respiration with smaller 
animals, it is in the first place the influence of the movements that 
should be considered. For these are quicker with smaller individuals 
(also with warm-blooded ones); moreover, in these experiments, the 
movement through the water will depend not only upon gravitation 
but also upon the friction at the surface. 
The Scyllium, to be true, are during the investigation nearly 
always at rest. That also the tonus of the smaller animals is larger 
1 venture to surmise a priori. In the second place the difference in 
age should be considered, which plays an important part also with 
mammals. 
4. Probably very slowly growing animals, which during the 
experiments remain perfectly motionless, are the Scorpaena ustulata. 
The experiments made with these had the following result: 
TABLE 
III. 
Weight 
in gr. 
Cc0 2 p. hour 
individual 
ICcOnp.hour 
j and K.G. 
8 
0.38 
47.5 
21 
0.9 
45 
55 
2.5 
45.5 
With these animals as well as with the following I was unable 
to determine their surface. It appears, however, from Table III that 
the figures per K.G. and hour are about the same. 
5. As to the influence of the movements on the 0 f consumption, 
may say that a Crenilabrus occilatus, swimming regularly * n ^ 
daylight, consumed 0,56 Cc 0 2 per hour, 0,365 in the dark, whei 
the animal was not nearly so active. 
then compared two nearly full-grown individuals of Crenfla 
occilatus and Crenilabrus pavo in the dark. 
