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The Strange Case of Dr. Jekyll and Mr. Hyde

by Robert Louis Stevenson

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Why did Dr. Lanyon initially believe he was dealing with a case of cerebral disease?

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When Dr. Lanyon thinks he is dealing with a case of cerebral disease, it is when he has obeyed the instructions in the letter that Mr. Jekyll has sent him.  He thinks that Mr. Jekyll must have gone kind of crazy because of what he is asking Dr. Lanyon to do.

What Jekyll has asked is that Lanyon should go to Jekyll's house and get some stuff and bring it back to Lanyon's own home.  When Lanyon gets to Jekyll's house, he finds the stuff that Jekyll wants him to bring back.  The stuff seems so completely useless and unimportant that Lanyon figures that Jekyll has gone insane.

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