about nine o'clock
But some wonderful cures have been made with it . Come back tonight . My evening office hour is from eight to nine . Come about nine o'clock , so that I can take you the last one and have plenty of time for experiment . And there 's another thing , Felix , -- ah ! '' He stopped suddenly , as a little spasm of pain crossed his face , and pressed his hand against his heart . `` It 's nothing , '' he went on deprecatingly , at the other 's look of inquiry .