All of the functions of the body are operated by something very much akin to electricity--mental energy--so that aside from the fermentation which gluttony makes possible, the mere drag of handling of dead material in the body, that the body cannot use, for two or three days, is a wasteful draught on the available mental capacity. Using an electric power-plant as analogous to the Mind Power-Plant of the brain, and a trolley railroad as analogous to the machinery of the body--analogies which are very close by consistent similarity--the loading of the stomach with unprepared food, as in gluttony, is like loading flat cars with pig iron and running them around the line of the road in place of passenger cars, thereby using up valuable energy and wearing out the equipment without any profit resulting from the expenditure. To those who are familiar with the modern electric power-plant the analogy between it and the human individual equipment, or Mind Power-Plant, seems very remarkable. To those, however, who have not visited an electric power-plant a description is necessary. DESCRIPTION OF A MODERN ELECTRIC POWER-PLANT Fuel, of course, is the source of the power. Furnaces which are capable of producing heat with the least consumption of fuel, tubes within the boilers that permit the freest possible contact of the heat produced and the water to be turned into steam, steam pipes that are flexible and yet strong, machinery that moves with the least friction in order to concentrate and utilise the power of the steam, and dynamos out of which electricity is evolved, together with auxiliary pumps and hoists and blowers and whatnot other devices to help create, control and economise the energy, are the essential parts of an electric power-plant. To insure economy and accuracy these are made as nearly automatic as possible. At one end of the furnace house there is sunk in the cement floor a large iron scoop or tray into which cartloads of lump coal are dumped. This scoop-shaped receptacle is also the platform of a weighing machine so that each load is weighed. In the bottom of the scoop there is a trap-door, which, being opened, permits the coal to drop through between the teeth of a crusher where the large lumps are reduced, usually to the size of a small nut. From the crusher the coal falls into the buckets of an endless chain-hoist and is conveyed aloft to great hopper-shaped bins which occupy the entire space under the roof over the furnaces. Leading back from each bin to the constantly moving grate bars of the furnace underneath is a pipe which delivers the crushed coal to the grate bars and distributes it evenly over their surface as fast as it can be received into the furnace, regulated, of course, by the consumption that is going on inside the furnace.