( 627 ) 



Hamff {Soc. biol. 57 [1904] 264) it appeared already that the same 

 organs of animals of the same species contain mostly about equal 

 quantities of catalase and that this quantity is not dependent on the 



■. W 



\ w 



Number of milligrams Ho Oo decomposed 

 by five milligrams of different bloodspecies 

 after their having been heated at 63° for 

 some minutes in a dilution of 1 : 1000. 



_ :j^ 



7j ID T( 'jo 3? ÏÖ Ti s3 5v Co n 70 % ÏÖ ÏI j5 ^ ~<i ~s 7iti 



Human blood. 



--- -Monkey blood. 



Horse blood (arterial). 



Horse blood (venous). 



.,,.,>«.,^^*.^,.*0x blood. 



Goat blood. 



.♦..» ,..«^,.. ....*. ^ Pigeon blood. 



temperature of the body nor on the metabolism. To illustrate the 

 catalytic power of the bloodspecies which I investigated quantitati- 

 vely I add a short survey, 



