>There seem to be too many flaws in the experiment ...
I agree completely.
Probably he desperately wanted to prove that the soul exists, and saw evidence where there was none. But to me, even though I believe in a soul, the idea that it actually has a mass or weight is simply preposterous.
As to proving the existence of the soul, the investigations by Dr. Raymond A. Moody ("Life after Life") came much closer to that, although he himself admits that they are in no way an absolute proof.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)