Wide regions of glass formation have been found in the ternary system xAgI + yAg,As04 + (1 - x - y)AgPO,. Glasses containing up to 75 mol 7% AgI can be formed in sections greater than 2 cm thick without signs of devitrification. Glass transition temperatures as high as 175 OC for glasses containing - 10 mol % AgI fall to -45 OC at the highest AgI content. An equivalent ratio of Ag1:N is defined and it is found that, for all glass-forming compositions, the electrical data as expressed in the Arrhenius form, u = A exp(-E,,/RT), log (./(a cm)-’), log (A/(Q cm)-’), E,,/(kcal mol-’), and additionally T,/K, can be described as linear functions of N. These data are used to give support to the view of these glasses as being hosts to a ‘liquidlike” AgI giving rise to the high conductivity they exhibit, as high as 0.0143 (Q cm)-’ at room temperature for glasses containing the maximum AgI. Finally, from these linear relationships, functions for the mobility 1.1 and number of the mobile Ag’ cations n are developed.