"All dwellings should be _freely ventilated_ during the _night_ as well as day, and it is a great mistake to suppose, as in Liberia (where every settler sleeps with every part of his house closely shut -- doors, windows, and all) that it is deletereous to have the house ventilated during the evening, although they go out to night meetings, visit each other in the evening, and frequently sit on their porches and piazzas till a late hour in the night, conversing, without any injurious effects whatever."