  The main purpose of this notes is to supplement the paper reid, which treated
Minimal Model Program (also called Mori's Program) on toric varieties. We
calculate lengths of negative extremal rays of toric varieties. As an
application, we obtain a generalization of Fujita's conjecture for singular
toric varieties. We also prove that every toric variety has a small projective
toric $\bQ$-factorialization.
