436 A. I. OPARIN 



centration of the products of disintegration in the medium, for we must keep in 

 mind that the systems under investigation have active proteases, while the con- 

 centrations of added amino acids are quite high. 



In the conditions of our experiments only the concentration of sucrose was 

 varied, which altered the multimolecular structural elements, but had no effect 

 on the number and structure of molecules constituting them. 



The data reported above indicate that integrity of the multimolecular structure 

 is a necessary condition for the complete synthesis of protein, as measured by 

 the increase of protein nitrogen. It is, moreover, noteworthy that preservation of 

 a constant amount of nucleic acids in the system is not yet a sufficient factor 

 for the normal course of protein biosynthesis. 



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