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A characteristic change in the respiration, known as Cheyne-Stokes breathing occurs prior to death in some cases; it indicates that the respiratory centre in the medulla is becoming exhausted, and is stimulated to action only when the venosity of the blood has increased sufficiently to excite it.

It was very nearly a sine-wave modulation of the light—and when a Mahon-modified machine goes into sine-wave flicker, it is the same as Cheyne-Stokes breathing in a human.

Cheyne-Stokes breathing is admirably described as ‘that of a person recollecting himself’.

Of a sudden there is a sound as of a deep and labored inspiration, suggesting the upward curve of Cheyne-Stokes breathing.

So this was Cheyne-Stokes breathing, that rare and awful affliction!