Bottom boards reattached

When I constructed the two hives, I gave one of them a removable bottom board and wire screen.  During the summer, when the outdoor temperatures get into the 90's (Fahrenheit), having only a screen bottom allows the bees to regulate the hive temperature more easily and also allows debris to fall through.  Lately, though, temperatures have been getting cooler with night-time lows down in the 50's, so yesterday I reattached the bottom board.