Read it through once

I was silent; Helen had calmed me; but in the tranquillity she imparted there was an alloy of inexpressible sadness. I felt the impression of woe as she spoke, but I could not tell whence it came; and when, having done speaking, she breathed a little fast and coughed a short cough, I momentarily forgot my own sorrows to yield to a vague concern for her.