THE CONSTITUENTS OF DIPHTHERIA TOXIN 513 



to introduce as few factors as possible for purposes of calculation, 

 whereas biological analysis always seeks to pay due regard to the 

 wonderful multiplicity of organic matter. However, I believe that 

 these two methods can readily be combined and that this will be 

 very desirable. The biologist will have to content himself in so far 

 yielding to the economy of the mathematical view that he restricts 

 his assumptions to the smallest possible number. The physical 

 chemist, on the other hand, cannot escape the obligation of paying 

 due heed to this minimal multiplicity, the result of experimental 

 research. Naturally the problem is thus made extremely difficult, so 

 that success will require that the greatest authorities in physical 

 chemistry work hand in hand with the best biological talent. For 

 this reason I regard it as a great gain to science that so eminent a 

 leader as Svante Arrhenius is taking a lively interest in our work, 

 and has joined hands with my friend and pupil, Thorvald Madsen. 



