The great boast of the mathematicians is that Le Verrier calculated where Neptune was before it was discovered by Galle at Berlin, but the fact is he missed it eight astronomical units or over seven hundred millions of miles, and said Neptune was not the planet he was looking for. These are two average tests of mathematical calculations, and they are on a par with the mis-calculations of how much the sun must burn up annually under the so-called laws of gravity to supply the necessary heat to the earth and planets. Imagination--constructive ideality--is the highest gift of Deity to man, and the only faculty that can reason from the known to the unknown and comprehend the wonders and grandeur of the universe. I am not a practical chemist seeking the mysteries of nature in the laboratory, nor a professional scientist exploring the fields of original research; but, like La Place, Comte, Herbert Spencer and others, I formulate my theories and scientific hypotheses from the latest and best established facts of science as I see it. Science is only unified or systematic knowledge. Every fact is a scientific fact, and every truth is a scientific truth whether it pertains to so-called science or to religion or philosophy. Nature has no subdivisions of science, religion or philosophy, nor astronomy, chemistry or geology; but all things are a unity, constituting one harmonious universe; and he who separates science from religion or either from philosophy goes contrary to nature and divides the universe into fractions. As I am not a member of any scientific or religious association, I have no prejudices to overcome and seek the truth only, without fear, favor or undue predilections. Old traditions, fossilized theories and antiquated authority have little weight in my mind by the side of recent facts. But I am not an iconoclast, for I am more anxious to build up than to tear down. The professional scientists may deem such students of nature as myself who trespass upon their chosen domain as amateurs. If so, it is a proud distinction. Amateurs have accomplished nearly all the great things in the world's history. Cromwell was a farmer, Hastings and Clive were clerks, Bismarck twice failed in his examination to become a lawyer, Washington was a surveyor and Franklin a printer, Herschell was a musician, Faraday a bookbinder, Scott a lawyer's clerk, Arkwright, the inventor of the spinning machine, was a barber; Spinoza a glass-blower, Herbert Spencer an engineer, Edison a newsboy, and Stephenson, the inventor of the locomotive, an ordinary workman; Lincoln was a railsplitter, Grant a tanner, Andrew Johnson a tailor, Andrew Jackson a saddler, Vanderbilt a ferryman, Rothschild a peddler, Krupp a blacksmith, Paul a tent-maker, and Christ a carpenter. The names of distinguished amateurs could be continued indefinitely, but space forbids.