Duncan MacDougall (doctor)

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Duncan MacDougall
Bornc.1866
Died

October 15, 1920(1920-10-15)

(aged 54)
ResidenceHaverhill, Massachusetts, USA
CitizenshipAmerican
NationalityAmerican
FieldsBiologist
Known forattempting to weigh the soul upon death
 
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Duncan MacDougall
Bornc.1866
Died

October 15, 1920(1920-10-15)

(aged 54)
ResidenceHaverhill, Massachusetts, USA
CitizenshipAmerican
NationalityAmerican
FieldsBiologist
Known forattempting to weigh the soul upon death

Dr. Duncan "Om" MacDougall (c. 1866 – October 15, 1920) was an early 20th-century physician in Haverhill, Massachusetts who sought to measure the mass lost by a human body when the soul departed the body upon death.

Ideas about the soul[edit]

NYT article from March 11, 1907

In 1901, MacDougall weighed six patients while they were in the process of dying from tuberculosis in an old age home. It was relatively easy to determine when death was only a few hours away, and at this point the entire bed was placed on an industrial sized scale which was apparently sensitive to the gram. He took his results (a varying amount of perceived mass loss in most of the six cases) to support his hypothesis that the soul had mass, and when the soul departed the body, so did this mass. The determination of the soul weighing 21 grams was based on the average loss of mass in the six patients within moments after death. Experiments on mice and other animals took place. Most notably the weighing upon death of sheep seemed to create mass for a few minutes which later disappeared. The hypothesis was made that a soul portal formed upon death which then whisked the soul away.

MacDougall also measured fifteen dogs in similar circumstances and reported the results as "uniformly negative," with no perceived change in mass. He took these results as confirmation that the soul had weight, and that dogs did not have souls. MacDougall's complaints about not being able to find dogs dying of the natural causes that would have been ideal led one author to conjecture that he was in fact poisoning dogs to conduct these experiments.[1] In March 1907, accounts of MacDougall's experiments were published in the Journal of the American Society for Psychical Research and the medical journal American Medicine, while the news was spread to the general public by New York Times.

MacDougall's results are generally regarded as false, due to the flawed method used in the tests. All attempts to reproduce the results with better methods and equipment have failed[citation needed]. Author Robert L. Park also raises objections to MacDougall's findings in his "Superstition: Belief in the Age of Science." [2]

MacDougall's results are also brought into question due to the extreme variability in what few human subjects he had. Of the six people used, two were discounted for technical reasons, two lost weight initially which then continued to fall, and one lost weight which was later regained. Only one of the six had a sustained, non-changing loss in weight of approximately 21 grams.

Nonetheless, MacDougall's finding that presumably the human soul weighed 21 grams has become a meme in the public consciousness, mostly due to its claiming the titular thesis in the 2003 film 21 Grams.

In popular culture[edit]

References[edit]

  1. ^ Mikkelson, Barbara; Mikkelson, David P. (October 27, 2003). "Soul Man". Snopes. Retrieved February 17, 2007. "MacDougall's ... methodology ... was suspect, [his] sample size far too small, and [his] ability to measure changes in weight imprecise. For this reason, credence should not be given to the idea his experiments proved something, let alone that they measured the weight of the soul ... His postulations on this topic are a curiosity, but nothing more." 
  2. ^ Robert L. Park. Superstition: Belief in the Age of Science; Princeton University Press; 2009; page 90

External links[edit]