This report, DMIC Report 136B, is the second of a series on the effects of alloying elements in titanium. The first, DMIC Report 136A, dealt with the constitution of binary and ternary alloys. A subsequent volume, to be designated DMIC Report 136C, will be concerned with mechanical properties of titanium alloys. ADDENDUM TO DMIC REPORT 136A During the preparation of DMIC Report 136A, the magnifications of several photomicrographs were inadvertently omitted. Specifically, the photographs shown in Figures 32 and 93 (pages 61 and 146, respectively) were taken at a magnification of 250X while the photograph shown in Figure 94 (page 147) was taken at a magnification of 7500X.