Mare Nubium was ideally suited to the growth of anaerobic bacteria, soil organisms, phage, rare moulds, and all those microscopic life forms, essential to medicine and industry, which required airless culture. Bacteria, Inc. was a huge mosaic of culture fields traversed by catwalks spread around a central clump of barracks, offices, and plant. Each field was a giant glass vat, one hundred feet in diameter, twelve inches high and no more than two molecules thick.