Neutron activation analysis is used as a method of investigation into the technological development and raw materials used in the production of glass in the first millennium A.D. Samples were selected with two aims in mind: first, there is the determination of whether or not vessel glass from the two regions can be assigned to a common area of manufacture as has been suggested on the basis of major element analysis. Secondly, the results complement a project of major element analysis by the energy-dispersive x-ray fluorescence technique and can be used to provide a further characterization of some raw materials by correlation with XRF data. The material analyzed includes fragments from Helgö, Sweden, and from Saxon Southamton (Hamwih). Samples and flux monitors were irradiated in the Herald reactor at Aldermaston for 48 hours and the gamma-ray spectra recorded in two counting periods, one week after irradiation and again after a further period of four weeks. A general discussion of the archaeological significance of the data is made together with a review of problems that this technique presents with regard to the analysis of early glass. Some types were differentiated. -- AATA