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Claim: A physician once placed dying patients upon a scale in order to measure the weight of the human soul.
Example: [Evans, 1946]
Origins: Most of those of a religious bent believe in life everlasting for the faithful, a continuation of the life force that reaches far beyond the limitations of mortal flesh. In such belief systems, death is not an end but a transformation: though people shed their corporeal selves at the moment of demise, that
Yet as much as we believe in the concept of "soul," this life spark remains strictly an article of faith. As central as it is to our perception of ourselves, it can't be seen or heard or smelled or touched or tasted, a state of affairs that leaves some of us uneasy. Without the soul, dead is dead. But if it could be proved to exist, a great deal of anxiety over what happens to us when we die would be vanquished. Enter Dr. Duncan MacDougall of Haverhill, Massachusetts. The doctor postulated the soul was material and therefore had mass, ergo a measurable drop in the weight of the deceased would be noted at the moment this essence parted ways with the physical remains. The belief that human beings are possessed of souls which depart their bodies after death and that these souls have detectable physical presences were around well before the
The patient's comfort was looked after in every way, although he was practically moribund when placed upon the bed. He lost weight slowly at
MacDougall repeated his experiment with fifteen dogs and observed that "the results were uniformly negative, no loss of weight at death." This result seemingly corroborated MacDougall's hypothesis that the loss in weight recorded as humans expired was due to the soul's departure from the body, since (according to his religious doctrine) animals have no souls. (MacDougall's explanation that "the ideal tests on dogs would be obtained in those dying from some disease that rendered them much exhausted and incapable of struggle" but "it was not my fortune to get dogs dying from such sickness" led author Mary Roach to observe that "barring a local outbreak of distemper, one is forced to conjecture that the good doctor calmly poisoned fifteen healthy canines for his little exercise in biological theology.")
the rate of one ounce per hour due to evaporation of moisture in respiration and evaporation of sweat.
During all three hours and forty minutes I kept the beam end slightly above balance near the upper limiting bar in order to make the test more decisive if it should come. At the end of three hours and forty minutes he expired and suddenly coincident with death the beam end dropped with an audible stroke hitting against the lower limiting bar and remaining there with no rebound. The loss was ascertained to be three-fourths of an ounce. This loss of weight could not be due to evaporation of respiratory moisture and sweat, because that had already been determined to go on, in his case, at the rate of one sixtieth of an ounce per minute, whereas this loss was sudden and large, three-fourths of an ounce in a few seconds. The bowels did not move; if they had moved the weight would still have remained upon the bed except for a slow loss by the evaporation of moisture depending, of course, upon the fluidity of the feces. The bladder evacuated one or two drams of urine. This remained upon the bed and could only have influenced the weight by slow gradual evaporation and therefore in no way could account for the sudden loss. There remained but one more channel of loss to explore, the expiration of all but the residual air in the lungs. Getting upon the bed myself, my colleague put the beam at actual balance. Inspiration and expiration of air as forcibly as possible by me had no effect upon the beam. My colleague got upon the bed and I placed the beam at balance. Forcible inspiration and expiration of air on his part had no effect. In this case we certainly have an inexplicable loss of weight of three-fourths of an ounce. Is it the soul substance? How other shall we explain it?2 In
Fellow Massachusetts doctor
It would take a great deal of credulity to conclude that MacDougall's experiments demonstrated anything about post-mortem weight loss, much less the quantifiable existence of the human soul. For one thing, his results were far from consistent, varying widely across his half-dozen test cases:
Dr. MacDougall admitted in his journal article that his experiments would have to repeated many times with similar results before any conclusions could be drawn from them:
If it is definitely proved that there is in the human being a loss of substance at death not accounted for by known channels of loss, and that such loss of substance does not occur in the dog as my experiments would seem to show, then we have here a physiological difference between the human and the canine at least and probably between the human and all other forms of animal life.
Nonetheless, MacDougall believed he was onto something — four years later the New York Times reported in a front-page story that he had moved on to experiments which he hoped would allow him to take pictures of the soul:
I am aware that a large number of experiments would require to be made before the matter can be proved beyond any possibility of error, but if further and sufficient experimentation proves that there is a loss of substance occurring at death and not accounted for by known channels of loss, the establishment of such a truth cannot fail to be of the utmost importance.2
Dr. Duncan MacDougall of Haverhill, who has experimented much in the observation of death, in an interview published here to-day expressed doubt that the experiments with
MacDougall seems not to have made any more experimental breakthroughs regarding the measurement of the human soul after 1911 (at least, none considered remarkable enough to have been reported in the pages of the New York Times), and he passed away in 1920. Nonetheless, his legacy lives on in the oft-expressed maxim that the human soul weighs Dr. McDougall is convinced from a dozen experiments with dying people that the soul substance gives off a light resembling that of the interstellar ether. The weight of the soul he has determined to be from one-half ounce to nearly an ounce and a quarter.4 What to make of all this? MacDougall's results were flawed because the methodology used to harvest them was suspect, the sample size far too small, and the 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 as An interesting counterpoint to this item is another widespread belief of those long-ago times, one which held that the human body gained weight after death — the exact opposite of what
More prevalent is the other belief, expressed in the phrase "dead weight," that a body weighs more after death. But it only seems to weigh more. We carry our own bodies about so easily that we are unaware of what an exertion it really requires. And when, in some emergency that forces us to bear the additional weight of another body, we feel a gravitational pull of from two hundred and fifty to three hundred pounds, we are astonished and assume that the other body has somehow acquired additional heaviness. The weight of a corpse, or even of an amputated limb, is startling when felt for the first time. A husky man, flourishing his arms about, has no idea that they weigh as much as twenty-pound sacks of sugar; and a jitterbugging girl doesn't realize that she is throwing a couple of forty-pound legs around as if they were ping-pong balls.1
Sightings: The title of the 2003 film Last updated: 17 July 2007 This material may not be reproduced without permission. snopes and the snopes.com logo are registered service marks of snopes.com.  Sources:
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