“Back of the face,” he explained, “is a small glass bulb which holds two ounces of liquid, which, to make very clear to you, I will call the Principal liquid. This fluid is used in the production of heat, light and cold. Extending from the bulb are ten thousand small glass tubes, through some of which this liquid flows to the center of each miniature picture of the face of the sun on the ceiling and wall, through others to the center of the miniature furnaces placed in the four walls of the room two feet from the floor, and still through others to the small glaciers which so beautifully adorn the walls twenty-four inches from the ceiling. In the center of each small representation of the face of the sun is a hollow glass button filled with another form of liquid obtained from the sun’s rays, which we call ‘Light Fluid.’ When light is required in a certain part or in the entire part in any room or hall in this building, a small lever is moved by pressing a button, conveniently situated for that purpose, which brings in contact the principal liquid and the ‘Light’ liquid, with the result you now see; the soft, mellow light spreading over the room, increasing in intensity until the amount of light required is had. “Heat is likewise produced by causing the principal fluid to unite with a liquid confined in the miniature furnace, which we term ‘Heat Fluid.’” Guillermo Gonzales touched a button, and the room gradually became very warm; so warm, in fact, that the audience was uncomfortable; murmurs of complaints were heard on every side. All the dainty fans carried by the ladies for effect only, were immediately put into use. The Governor fanned himself vigorously and wiped perspiration from his brow. “The efficiency of ‘Heat Fluid’ is well demonstrated, my friend,” said the Governor, addressing the scientist. “Make us cool; this heat is overpowering.” The intense heat gradually gave way to the cool breeze, which the Governor explained, “was caused by the uniting of the principal fluid with the fluid called ‘Cold Fluid,’ concealed within the small glaciers.” Every one in the room turned his face toward the ceiling to see the representation of glaciers, and was greatly surprised to feel the cold air falling on his face as the heat ascended. Cheer after cheer went up from the much pleased assembly. Their delight knew no bounds. It was the first knowledge they had of the means by which this magnificent auditorium was lighted, heated and made cool.