Here is an updated look at my most active fall Winogradsky Column, which is still sitting in the window in my office. This is not a great shot, but you can make out some of the colors in the mud where there should be a mixed area of aerobic and anaerobic activity. This is especially true because I have so much water in this column. Not that much activity can be seen from possible anaerobes at the very base of the bottle, however a broad growth of clearly phototrophic organisms ( greenish, red mass) is growing on the side that always faces the window. I'm guessing that the lowest layers indicate some growth of chemoautotrophs, organisms that are using fermentation. Apparently my rubber band disintegrated and I'll have to get a new one. Also, I think it's important to note that there is no smell coming from this column, though there was a point in the past when it did have a distinctly unpleasent odor.