Thyræus, I, 50.
Tides, New theory of, I, 393.
Tombstones of mathematicians, I, 106.
Tonal System, II, [182].
Tooke, H., I, 178.
Torriano, E., I, 250.
Towneley, II, [300].
Townley, C., II, [300].
Trisection problem, I, 118; II, [10], [12], [13], [15].
Troughton, I, 152.