In this paper it is pointed out that deliveries are a better means of arriving at an estimate of the healthiness of an hospital than amputations; that the deliveries in the Dublin Hospital are remarkably valuable because of their great number (nearly 200,000), and of the length of time of the hospital's operation (above 100 years); and that the evidence derivable from them relative to the danger of confinement, as regulated by the amount of aggregation, or number brought together at the same time, has never been properly taken.