Note 11 — Chapter XV · WINTERING BEES.
Reading edition
To secure a slight upward draught of air, to carry off the moisture arising from the bees, make a hole a half-inch in diameter in front and rear of the cap, in the center, close to the top or roof boards. (And here let me say, the roof boards, or boards covering the cap, should project about an inch, as they can be more firmly nailed, and make better joints; for driving rains must not be allowed to penetrate to the inside of the hive.) The inside of each hole should be covered with wire cloth, to keep out insects, etc.