What two things does Dr Jekyll try to do?

Apparently, he (Lanyon) received a very urgent letter from Jekyll that requested Lanyon follow very specific instructions by going to Jekyll's home and retrieving a specific drawer from his cabinet. Poole was to help him get into the upper room. Lanyon was to fetch the drawer and all of its contents and immediately return to his home. A messenger from Jekyll would come to claim the ingredients at midnight. Jekyll eventually drinks a concoction that will kill him.

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