KERATIN AND MOLECULAR BIOLOGY 7 



those made by Abderhalden and Voitinovici in 1907. Most of these are 

 today of little more than historical interest, but they served to sketch out the 

 broad outlines of the amino acid pattern of the group and to establish a 

 family unity. No purpose would be served here by reproducing these data. 

 Reference may be made to the paper by Simmonds (1955) in which a 

 table of all the results will be found. 



Table 1 . Percentage Weights of Amino Acids 

 in Wool 



* Simmonds (1955). 



f Corfield and Robson (1955). 



% Quoted by von Bergen (1954). 



The estimations in J were made by microbiological methods which 

 may not be as accurate as those used by the other authors. 



At the present time we possess reliable analyses by modern methods, 

 in which the greater part of the nitrogen of the proteins has been accounted 

 for, only of wool and feather. For purpose of reference we reproduce here 

 the analyses reported by Simmonds (1955) (Table 1 (a)), by Corfield 



