"I called their attention also to the absence of all means of ventilating the hall, remarking that, as we had already breathed the air which it contained for a full hour, it must have lost much of its vital properties and needed to be renewed"

This quote by George Combe is referring to the lack of ventilation in a hall. He is pointing out that the air in the hall has actually been taken a breath by every person in the room for an hour, and has actually for that reason shed a lot of its vital buildings as well as needs to be restored. He is stressing the importance of air flow in an area, as it is important for the wellness and also health and wellbeing of those inside. Without correct air flow, the air can wither and unhealthy, bring about a range of wellness concerns. Combe is additionally highlighting the requirement for proper air flow in order to preserve a healthy atmosphere. He is highlighting the relevance of having a system in place to guarantee that the air in an area is routinely renewed and also kept fresh. This quote acts as a reminder of the value of ventilation in any encased area, as well as the requirement to guarantee that the air is frequently restored.