Read it through once

His voice was weaker, so I moistened his lips with the brandy again, and he continued; but it seemed as though his memory had gone on working in the interval for his story was further advanced. I was about to call him back to the point, but Van Helsing whispered to me: “Let him go on. Do not interrupt him; he cannot go back, and maybe could not proceed at all if once he lost the thread of his thought.” He proceeded:--