When water is pumped by an engine and stored for use in a tank to be delivered under pressure in the house, then the additional cost of hot and cold water and the necessary sink and bath room fixtures is comparatively small. Modern plumbing fixtures fit so perfectly and go together so easily that the cost of installing house plumbing in the country has been materially reduced, while the dangers from noxious gases have been entirely eliminated. Open ventilator pipes carry the poisonous gases up through the roof of the house to float harmlessly away in the atmosphere. Septic tanks take care of the sewerage better than the sewer systems in some towns. Plumbing fixtures may be cheap or expensive, according to the wishes and pocketbook of the owner. The cheaper grades are just as useful, but there are expensive outfits that are very much more ornamental. FARM SEPTIC TANK [Illustration: Figure 236.--Frame for Holding Record Sheets in a Dairy Stable.] [Illustration: Figure 237.--Loading Shute for Hogs. This loading shute is made portable and may be moved like a wheelbarrow.] Supplying water under pressure in the farmhouse demands a septic tank to get rid of the waste. A septic tank is a scientific receptacle to take the poison out of sewerage. It is a simple affair consisting of two underground compartments, made water-tight, with a sewer pipe to lead the waste water from the house into the first compartment and a drain to carry the denatured sewerage away from the second compartment. The first compartment is open to the atmosphere, through a ventilator, but the second compartment is made as nearly air-tight as possible. The scientific working of a septic tank depends upon the destructive work of two kinds of microscopic life known as aerobic and anaerobic forms of bacteria. Sewerage in the first tank is worked over by aerobic bacteria, the kind that require a small amount of oxygen in order to live and carry on their work. The second compartment is inhabited by anaerobic bacteria, or forms of microscopic life that work practically without air. The principles of construction require that a septic tank shall be large enough to contain two days' supply of sewerage in each compartment; thus, requiring four days for the sewerage to enter and leave the tank. [Illustration: Figure 238.--Brass Valves. Two kinds of globe valves are used in farm waterworks. The straight valve shown to the left and the right angle valve to the right. Either one may be fitted with a long shank to reach above ground when pipes are laid deep to prevent freezing.]