A contemporary journal illustrates Mr. Gurney’s invention by the following analogy:—­“It will appear not a little singular that Mr. Gurney, who was educated a medical man, has actually made the construction of the human body, and of animals in general, the model of his invention.  His reservoirs of steam and water, or rather ‘separators,’ as they are called, and which are seen at the end of our plate, are, as it were, the heart of his steam apparatus, the lower pipes of the boiler are the arteries, and the upper pipes the veins.  The water, which is the substitute for blood, is first sent from the reservoirs into the pipes—­the operation of fire soon produces steam, which ascends through the pipes to the upper part of the reservoir, carrying with it a portion of water into the separators, which of course descends to the lower part, and returns to fill the pipes which have been exhausted by the evaporation of the steam—­the steam above pressing it down with an elastic force, so as to keep the arteries or pipes constantly full, and preserve a regular circulation.  In the centre of the separators are perforated steam pipes, which ascend nearly to the tops, these tops being of course closed, so as to prevent the escape of the steam.  Through these pipes the steam descends with its customary force, and is conducted by one main pipe all along under the carriage to the end of the platform, which is, in point of fact, the water tank, where it turns under till it reaches two large branch pipes which communicate with the cylinders, from which the pistons move and give motion to the machinery.  The cranks of the axle are thus set in action, and the rotatory movement is given to the wheels.  By the power thus engendered also a pump is worked, and which, by means of a flexible hose, pumps the water into the boiler, keeping the supply complete.  The tank and furnace, it is calculated will hold sufficient water and fuel for one hour’s consumption, the former being sixty gallons.”

The vehicle resembles the ordinary stage-coaches, but is rather larger and higher.  Coke or charcoal are to form the fuel, by which means smoke will be avoided; the flues will be above the level of the seated passenger, and it is calculated that the motion of the carriage will always disperse the heated rarefied air from the flues.

The present carriage would carry six inside and fifteen outside passengers, independent of the guide, who is also the engineer.  In front of the coach is a very capacious boot; while behind, that which assumes the appearance of a boot is the case for the boiler and the furnace.  The length of the vehicle, from end to end, is fifteen feet, and, with the pole and pilot-wheels, twenty feet.  The diameter of the hind wheels is five feet; of the front wheels three feet nine inches; and of the pilot-wheels three feet.  There is a treble perch, by which the machinery is supported, and beneath which two propellers, in going