1. We have shown again and with a larger group of patients the effects of RNA administered intravenously upon the memory performance of patients suffering from organic memory defect.2. We have demonstrated that it is possible to make a beginning in the task of analyzing which mechanisms within the memorial process are particularly favorably affected by RNA.3. Thus far the indications are: i) that RNA acts upon the mechanism for retention, ii) that there is possibly a hitherto unrecognized mechanism for the storage of data by classification, iii) that there are other as yet unidentified mechanisms within the memorial process apart from retention which are favourably affected by RNA.Abstract Teaser