The Prophet Joseph does not use the language of science; which is additional proof that he did not know the science of his day. This may be urged as an objection to the assertion that he understood fundamental scientific truths, but the error of this view is easily comprehended when it is recalled that the language of science is made by men, and varies very often from age to age, and from country to country. Besides, the God who spoke to Joseph Smith, says, "These commandments were given unto my servants in their weakness, after the manner of their language, that they might come to understanding."[A] If God had spoken the special language of science, the unlearned Joseph Smith would not, perhaps, have understood. Every wise man explains that which he knows in the language of those to whom he is speaking, and the facts and theories of science can be quite easily expressed in the language of the common man. It is needless to expect scientific phraselogy in the writings of Joseph Smith. [Footnote A: Doctrine and Covenants 1:24.] Scientific details are almost wholly wanting in the writings of Joseph Smith. Had the Prophet known the science of his day, his detailed knowledge would have been incorporated somehow in his writings. The almost complete absence of such scientific detail as would in all probability have been used, had the Prophet known of it, is additional testimony that he did not get his information from books. Finally, another important fact must be mentioned. Men in all ages have speculated about the things of the universe, and have invented all kinds of theories to explain natural phenomena. In all cases, however, these theories have been supported by experimental evidence, or else they have been proposed simply as personal opinions. Joseph Smith, on the contrary, laid no claim to experimental data to support the theories which he proposed, nor did he say that they were simply personal opinions, but he repeatedly asserted that God had revealed the truths to him, and that they could not, therefore, be false. If doctrines resting upon such a claim can be shown to be true, it is additional testimony of the truth of the Prophet's work. [Sidenote: Purpose of the following chapters.] In the following chapters it will be shown, by a series of comparisons, that, in 1833, or soon thereafter, the teachings of Joseph Smith, the Mormon Prophet, were in full harmony with the most advanced scientific thought of today, and that he anticipated the world of science in the statement of fundamental facts and theories of physics, chemistry, astronomy and biology. THE FUNDAMENTAL CONCEPTS OF THE UNIVERSE. Chapter II. THE INDESTRUCTIBILITY OF MATTER. [Sidenote: Until recent days many believed that matter could be created or destroyed.]