2. If tryptic hydrolysis is carried out in a medium containing 6 % of lithium thiocyanate no precipitation occurs, and the hydrolysate may be acidified and dialysed to give a solution of peptides of high molecular weight. 3. Further hydrolysis of this fraction with chymotrypsin shows that it consists predominantly of long sequences of amino acid residues throughout which glycyl residues alterna...

1. A method is given whereby the course of hydrolysis of sucrose by live yeast cells may be followed with precision equal to that found when invertase solutions prepared from autolyzed yeast are used to cause inversion. 2. The practical value of the equation of Nelson and Hitchcock as a means of following the course of enzymic hydrolysis of sucrose is hereby extended. 3. The inversion of sucros...