Ken had explained the comet's daily infinitesimal retreat and there was a kind of steady excitement in estimating how much it diminished each day. Actually, a week's decrease was too small for the naked eye to detect, but this did not matter. Radio reports continued to tell of increased construction of projectors throughout the world. Tests were showing they were effective beyond all previous hopes. The populace of Mayfield was enthusiastic about the construction of additional units. Two more had been built, and three others were planned. Serious attention had to be given now to the coming planting season. Every square foot of available ground would have to be cultivated to try to build up stores for all possible emergencies of the following winter. When the time came for making the first work assignments on the farms, Professor Maddox and Professor Larsen appeared to receive theirs. Sheriff Johnson was in the office at the time. "What are you two doing here? You can get back to your regular business," he stormed. "We aren't that hard up for farmers!" "We have no regular business," said Professor Maddox. "The projector work is being taken care of. Mayfield will probably not be the site of a university again during our lifetimes. We want to be assigned some acres to plow. By the way, did you hear Art Matthews has got three more tractors in operation this week? If we can find enough gasoline we may be able to do the whole season's plowing by machine." "You're sure you want to do this?" said Sheriff Johnson. "Quite sure. Just put our names down as plain dirt farmers." * * * * * Ken clung to the radio for reports of the outside world. The batteries were all but exhausted, but a motor generator could be allotted to the station as soon as other work was out of the way. In Pasadena, they told him a diesel railway engine had been successfully decontaminated and put into operation. Airtight packing boxes had been designed for the wheels to keep them from being freshly affected by the dust remaining in the air. It was planned to operate a train from the metropolitan area to the great farming sections to the east and north. A few essential manufactures had also been revived, mostly in the form of machine shops to decontaminate engine parts. Negotiations were under way to try to move the great wheat and other grain stocks of the Midwest down the Mississippi River to New Orleans and through the Panama Canal to the Pacific Coast cities. Oldtime sailing vessels, rotting from years of disuse, were being rebuilt for this purpose.