CHAPTER FOUR

The First Skeptic

Jan Ingenhousz was a Dutch physician, court doctor to the Empress Maria Theresa, and one of the finest experimentalists of the century. In 1779 he had discovered something far more important about plants than anything electricity would ever show: that green leaves, in sunlight, purify the air, and that they do the opposite in the dark. He had found photosynthesis.

Ingenhousz was also an expert electrician, a friend of Franklin, and he had no prejudice against electroculture. He simply tried it properly.

The experiment done right

In the 1780s he raised sets of seedlings side by side under conditions as nearly equal as he could make them. Some he electrified strongly, for long periods. Some he left alone. Some he shielded from any atmospheric electricity. He repeated the trials. He found no difference.

Then he did something more valuable still: he worked out why the others had been fooled. A plant under experiment gets attention. It is moved to a convenient place, often nearer the window; it is watered on schedule; it is watched. Above all, Ingenhousz argued, it gets more light, and he knew better than any man alive what light does to a plant. The enthusiasts had not controlled for the one factor that mattered most, because they had not known it mattered.

He published his conclusion plainly: the supposed effect of electricity on vegetation was an error.

The pattern is set

Bertholon’s supporters replied; other experimenters took sides. But Ingenhousz’s reputation was great, his method was better, and by 1800 learned opinion had swung against electroculture. The subject went quiet for forty years.

It is worth pausing here, because the next two centuries repeat this first half-century almost exactly:

• An enthusiast reports striking results from a few plants.
• The idea spreads quickly, carried by its promise of free abundance.
• A careful experimenter with proper controls finds little or nothing.
• Interest collapses, and a generation later someone begins again, usually unaware of how the last round ended.

This cycle is the single most important fact in the history of electroculture. When people say the knowledge was “lost” or “hidden,” what they are noticing is real: the subject does keep disappearing. But it disappears each time for the same recorded reason. It is not that someone locks it away. It is that the results will not hold still.

That does not mean Ingenhousz had the last word. He tested static electricity from a machine on seedlings in pots. He did not test sustained high-voltage fields over a field crop through a whole season, because no one could yet build such a thing. When men finally could, the results would be harder to dismiss.