Evening diners also escape the risk of sunstrokes. "Surfeit strokes" would be a far more appropriate name for an affection almost unknown in Spanish America, where rich and poor suspend labor during the heat of the afternoon. The self-regulating tendency of our organism can hold its own against a temperature of 105 degrees Fahrenheit in the shade; it might resist the added grievance of superfluous clothing, but succumbs to a combination of sun-heat, sweltering dry-goods, and superheated, greasy made-dishes. A sunstroke fit is, in fact, caused by what physicians call a "zymotic process of blood-changes"—in plainer words, the humors of the living body begin to ferment. The system has ways of its own to counteract that risk, but may try in vain to apply them when its energies are diverted by the task of compromising a reckless surfeit. Who has not noticed the bodily and mental vigor that facilitates all sorts of work in the early morning hours? It is only partly due to a difference of temperature, for indoor-workers, too, experience its benefits, and it would be a mistake to suppose that the invigorating effects of a good night's rest are limited to the early forenoon. At least half the morning energy is due to the fact that ex-
