Sherlock Holmes approached the body, and, kneeling down, examined it intently. “You are sure that there is no wound?” he asked, pointing to numerous gouts and splashes of blood which lay all round.
“Positive!” cried both detectives.
“Then, of course, this blood belongs to a second individual—presumably the murderer, if murder has been committed. It reminds me of the circumstances attendant on the death of Van Jansen, in Utrecht, in the year ‘34. Do you remember the case, Gregson?”
“No, sir.”
“Read it up—you really should. There is nothing new under the sun. It has all been done before.”
As he spoke, his nimble fingers were flying here, there, and everywhere, feeling, pressing, unbuttoning, examining, while his eyes wore the same far-away expression which I have already remarked upon. So swiftly was the examination made, that one would hardly have guessed the minuteness with which it was conducted. Finally, he sniffed the dead man’s lips, and then glanced at the soles of his patent leather boots.
“He has not been moved at all?” he asked.
“No more than was necessary for the purposes of our examination.”
“You can take him to the mortuary now,” he said. “There is nothing more to be learned.”

A Study in Scarlet Chapter 3