THERMOTAXIS 



071 



thermal animal. This is in favour of the view that in the larger 

 mammals a nervous regulation of the intensity of the metabolism 

 is not of prime importance. 



Relations between Heat-Production, Surface Area, and Blood-Flow. 

 The following table shows how close is the agreement in the heat- 

 production per unit of surface calculated by the formula for animals of 

 different species and very different body- weight: 



The next table, calculated by Rubner from the quantity of tissue- 

 protein and fat consumed, gives the relative intensity of heat-produc- 

 tion in fasting dogs of different sizes: and along with it is given for 

 comparison some of the results on the output of the heart in dogs of 

 different weight, obtained by the method of injecting salt solution 

 into the ventricle described on p. 139. 



It is obvious that the two quantities., heat-production (or loss) and 

 heart-output, vary in the same general way. The reason is clear. 



