DEOXYPENTOSE NUCLEIC ACIDS 87 



refer to them later. But one thing should be stressed here. Some 

 people are bothered by such similarities as I have shown in Table 

 21, and I have heard it said, and also read it in one of the reviews 

 of the recent treatise on nucleic acids^ that there is no convincing 



TABLE 20 



COMPOSITION OF SEVERAL TOTAL DEOXYRIBONUCLEIC ACIDS 



evidence that the deoxypentose nucleic acids of mammaUan tis- 

 sues differ from one species to another. I should, however, like 

 to submit an entirely opposite proposition, namely, that once it 

 is shown that there exist different nucleic acids (Table 20), it is 

 safer to assume that all nucleic acids are species- specific. For we 



TABLE 21 



EXAMPLE OF TWO DEOXYRIBONUCLEIC ACID SPECIMENS 

 INDISTINGUISHABLE ANALYTICALLY 



References p. 98 



