In experiments at pressures of 3.0 and 3.2 GPa we were able to detect solid-phase transition of orthorhombic phosphorus to rhombohedral allotrope by electrical resistivity measurements at a continuous temperature increase (T-scans); the results are represented by blue semi-filled diamonds in Fig. . These results are in excellent agreement with the data on this transition obtained earlier by Kikegawa et al. in p-scans (see Fig. ).