About 1689 his health, never very strong, began to fail seriously and he gradually withdrew from his public engagements, ceasing his communications to the Royal Society, and advertising his desire to be excused from receiving guests, "unless upon occasions very extraordinary," on Tuesday and Friday forenoon, and Wednesday and Saturday afternoon.
It was most frequented in the forenoon, and then only by men.
Mrs. Cummings was taken away to the Sister's hospital this forenoon and I fear she shan't ever return.
All three Paris curves show three peaks, the first and third representing the ordinary forenoon and afternoon maxima.
Simultaneously the forenoon maximum occurs earlier and the afternoon maximum later in the day.