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I guess you'd have to say that Lang's experiment worked, although not as he originally described it. Adam was given life, but Lang's original premise was that Barnabas' essence would be transferred to Adam's body, leaving Barnabas' original body a lifeless shell.
What I find curious is that, as is evident from his dying message to Julia, Lang was aware of the possibility of both bodies surviving. I wonder why he never mentioned this possibility to Barnabas and Julia?
As for Dr. Longworth's experiment, I guess this too would have to be considered a success, as it surely brought out the dark side of his personality, which was the objective of the experiment. Unfortunately, the repercussions were quite tragic. I wonder if a stronger individual could have kept the darker aspects of his personality from taking control of him, as Yeager did to Longworth?