HYDROLYSIS — ESTIMATION OF BASES IN PNA 



207 



TABLE III 

 Percentage Molar Proportions of the Purine and Pyrimidine Bases in the 

 Nucleic Acid from Purified Tobacco Mosaic Virus and from Certain of 

 Its Strains, in the Purified Virus and in the Trichloroacetic Acid- 

 Insoluble Nucleoproetin (TCA Nucleoprotein) as Reported 

 BY Different Workers 



° The abbreviations are those used by Knight.*' 

 TMV = common strain of tobacco mosaic virus 

 M = Holmes masked strain 

 Y.A. = Yellow aucuba strain 

 The six strains include TMV, M, Y.A., JuDi (a lethal strain in young tobacco plants), GA (a green mottling 

 strain derived from yellow aucuba), and HR (the Holmes Rib-grass strain). 



The standard errors of the mean as calculated from the data of Knight'^ and as found by Cooper and 

 Loring." The values are similar to those given by Black and Knight." 



