50,000,000 years old, by the time the planets are thrown off, in turn, from Neptune to the earth, and then the earth cooled sufficiently for animal life, only a few million years would be left for evolution, a mere fraction of the time required. This is a mathematical demonstration that evolution can not be true. The same calculations, 18,000,000 to 20,000,000 years, have been made by Lord Kelvin, Prof. Todd and other astronomers. 2. The thickness of the earth’s crust is fatal to the theory of the great age of the earth, required by evolution. The temperature increases as we descend into the earth, about one degree for every 50 feet, or 100 degrees per mile. Therefore, at 2 mi., water would boil; at 18 mi., glass would melt (1850°); at 28 mi., every known substance would melt (2700°). Hence the crust is not likely more than 28 miles thick,—in many places less. Rev. O. Fisher has calculated that, if the thickness of the earth’s crust is 17.5 mi., as indicated by the San Francisco earthquake, the earth is 5,262,170 years old. If the crust is 21.91 mi. thick, as others say, the age would be 8,248,380 years. Lord Kelvin, the well known scientist, who computed the sun’s age at 20,000,000 years, computed the earth’s age at 8,302,210 years. Subtract from these computations, the years that must have elapsed before the earth became cool enough for animal life, and the few millions of years left would be utterly insufficient to render evolution possible. Note how these figures agree with the age of the earth according to the Helmholtz contraction theory. The thinness of the earth’s crust is also proven by the geysers, the volcanoes, and the 9000 tremors and earthquakes occurring annually in all parts of the world. 3. The surface marks on the earth point to much shorter periods of time since the earth was a shoreless ocean than those required by evolutionists, who are so reckless in their guesses and estimates. They help themselves to eternity without stint. Charles Lyell, a geologist of Darwin’s time, set the example when he said, “The lowest estimate of time required for the formation of the existing delta of the Mississippi is 100,000 years.” According to careful examination made by gentlemen of the Coast Survey and other U.S. officers, the time was 4,400 years—a disinterested decision. In the face of these three arguments, it is a bit reckless to say the earth has existed, 1,600,000,000 years,—nearly 100 times as long as proven possible by mathematical calculation. And still more reckless is the estimate of Prof. Russell, 4,000,000,000 to 8,000,000,000 years, founded on the radio-activity theory. All these wild estimates are out of the question. The recession of the Niagara Falls from Lake Ontario required only 7,000 to 11,000 years. It required only 8,000 years for the Mississippi River to excavate its course.