Thermometer bulb

The thermometer bulb, submerged in the cooling bath at Ninewells on this fourteenth day of May, registers a steady decline that the mind is hurried to complete before the mercury has settled. Beside it, the 915MHz generator hums with a constancy that the attendants mistake for a promise. In the reported dossier, the survival benefit of forty-two percent sits fixed upon the page, yet here in the room, the heat is merely a sequence of impressions: the tactile warmth of the skin, the flickering of the monitor, the patient’s rhythmic breath. These perceptions follow one another with a regularity that begets a most stubborn habit of expectation. Because the microwave pulse has been followed by the shrinking of the sarcoma in three hundred cases, the imagination leaps over the gap between the present radiation and the future recovery.

To publish this finding while the causal link remains a mere conjunction of events is to mistake the strength of our own habits for a quality in the objects themselves. We see the heat; we see the survival; we do not see the power that connects them. The meta-analysis offers an odds ratio of 2.67, a figure which provides a comfortable cushion for the mind to rest upon, but it remains a record of what has been, not a demonstration of what must be. A scientist who announces a certainty before the caveats are weighed is like a man who, having seen the sun rise every morning of his life, becomes indignant at the suggestion that the celestial machinery could ever falter.

The current data bundle is persuasive, yet the signal-state amendment proves that our previous confidence was a product of our own enthusiasm rather than a discovery of a necessary law. The survival benefit is a historical fact, recorded with care; the claim that it will persist in the next patient is a custom of the mind. By rushing to print, we treat a high probability as if it were a mathematical demonstration, forgetting that our belief is merely a vivid idea associated with a present impression. The generator continues its low vibration against the quiet of the ward.