Yesterday I was almost willing to accept Van Helsing's monstrous ideas, but now they seem to start out lurid before me as outrages on common sense.

I have no doubt that he believes it all.

I wonder if his mind can have become in any way unhinged.

Surely there must be some rational explanation of all these mysterious things.

Is it possible that the Professor can have done it himself?
He is so abnormally clever that if he went off his head he would carry out his intent with regard to some fixed idea in a wonderful way.