Bcffalo, N. Y., July 2.- R. ibert W. Flack, who vvill raou through tbe whirli.ool rapids Aug. t with Charles A. Percy, has arnve.l here, and will make a trial trip Wednesday alteriioon in bis peculiar craft, che Phantom. F, ar-k thinks he can go the seven miles to Lewistoii, ini-iu ling a considerable distance of comparatively still water, in thirty minutes. Bis race with Percy will be for Y500. Flack seems perïectiy contident oL succeeding, but sorae old rivr men wlio saw his boat called it a deatli-trap. .