Tower, W. S., cited, [178].

Trachyte, [463].

Transgression, of the sea, [37].

Transparency, of minerals, [451].

Travertine, [184], [464].

Trees, how affected by advancing lava, [133];

undermined on stream meanders, [164].

“Trellis drainage”, [175].

Troughline, of a syncline, [42].

Trunk channels of descending water, [181].