1. A PROCESS FOR THE MANUFACTURE OF FIBRES COMPOSED OF POLYMERS CONSISTING ESSENTIALLY OF UNITS OF AN OPTICALLY ACTIVE FORM OF A GLUTAMIC ESTER CHOSEN FROM THE GROUP CONSISTING OF GAMNA-METHYL-GLUTAMATE AND GAMMA-ETHYLGLUTAMATE WHICH COMPRISES POLYMERISING AN OPTICALLY ACTIVE N-CARBOXY ANHYDRIDES CHOSEN FROM THE GROUP CONSISTING OF THE N-CARBOXY ANHYDRIDES OF GAMMA-METHYL-GLUTAMATE AND GAMMA-ETHYL-GLUTAMATE IN AN ORGANIC LIQUID MEDIUM WHICH IS A SOLVENT FOR THE POLYEPTIDE WHILE IT IS STILL THE POLYPEPTIDE IS IN THE A CONFIGURTION ON EXTRUSION, AND BY WEIGHT OF UNITS OF THE OPITCALLY ACTIVE GLUTAMIC ESTER EXTRUDING A SOLUTION STATE INTO A SETTING MEDIUM SO THAT THE IN THE SOLVATED STATE INTO A SETTING MEDIUM SO THAT THE POLYPEPTIDE IS IN THE A CONFIGURATION ON EXTRUSION, AND STETCHING THE RESULANT THREADS THEREBY CONVERTING THE POLYPETIDE SUBSTANTILLY INTO THE B CONFIGURATION AND SUBSTANTILLY ORIENTING THE FIBRE ALONG ITS AXIS.