But now, to my intense horror, I knew that I could never put away the vision of those glorious eyes; and alas! the very diablerie of the woman, whilst it horrified and repelled, attracted in even a greater degree.
Notice the “alas!” in the middle of a sentence. I have never seen exclamation point in the middle of a sentence used like this before. Was this a common practice at the time this book was published? What is the history of this practice?