"Miss Van Meeker Constantia stood for a minute at the window gazing, toward the little park, flooded with the mellow afternoon sunlight. With the eye of a botanist she viewed the flowers -- most potent weapons of insidious May. With the cool pulses of a virgin of Cologne she withstood the attack of the ethereal mildness. The arrows of the pleasant sunshine fell back, frostbitten, from the cold panoply of her unthrilled bosom. The odour of the flowers waked no soft sentiments in the unexplored recesses of her dormant heart. The chirp of the sparrows gave her a pain. She mocked at May."

O.Henry here alludes to a apocryphal legend of very early
Christianity.Here is a very long URL about it, not really worth looking at. But I had to check.