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Once Jekyll turned into Hyde involuntairly he realized that he was in great danger of being trapped in the body of Hyde permanently. Thus, he lived as himself for two months swearing he wouldn't transform himself again. After awhile, Jekyll grew bored with his pure and virtuous life, and gave in to his baser urges, albeit in his own identity. However, even though he did not transform himself into Hyde, partaking in evil activity at all strengthened Hyde inside of him. Thus, Jekyll suffered another spontaneous transformation, this time in a park outside of his home. Afraid he would be captured by the police, and unable to return to his home because the servants would see him and report him, Hyde sent for Lanyon's assistance. From that night forward, Jekyll had to take double doses of the potion every six hours to avoid unintentionally waking up as Hyde. When the drug wore off, Hyde would appear, and it was the beginnings of such a transformation that Enfield and Utterson witnessed at the cabinet window.