92 INTRODUCTION TO GENERAL PHYSIOLOGY 



has been arrived at after numerous investigations, at first 

 apparently complex and contradictory. 



From previous remarks in various places of this book, it will be 

 clear that reduction processes also play an important part in cell 

 life. Some of these processes, up to the present, have been shown 

 to be under the control of enzymes, and substances similar to 

 aldehydes take the place of peroxides. But the mechanism is still 

 somewhat obscure (P., p. 586). It will be clear that when one 

 substance is reduced, another has to be oxidised in order to take 

 away the oxygen from the first (E., p. 203). 



