POLYPEPTIDI 43 



This tripeptide was not identical with a natural one isolated from the 

 products of the partial hydrolysis of edestin (p. 83). 



Fischer and van Slyke have combined a-pyrrole-carboxylic acid, 

 which is closely related to proline, with glycine in this way. 



The accompanying table gives a list of the compounds prepared by 

 this method. 



