The claim (9) that the rapid softening of dying tissue of the medlar fruit (Mespilus germanica L.) has been proven to be due to protopectinase, has to be cancelled. It can merely be upheld that some enzyme system is involved and that in all probability it is not due to oxydation of pectin, nor to ion-exchange. The softening is accompanied by an increase of soluble and a decrease of insoluble pectin, but no galacturonic acid is produced.