Read it through once

Here again I paused abruptly, and now with a feeling of wild amazement--for there could be no doubt whatever that, in this instance, I did actually hear (although from what direction it proceeded I found it impossible to say) a low and apparently distant, but harsh, protracted, and most unusual screaming or grating sound--the exact counterpart of what my fancy had already conjured up for the dragon's unnatural shriek as described by the romancer.