15. _Chemistry_.--A specimen of Bible chemistry is found in the story of "fire and brimstone descending from heaven together" without a coalescence, or the chemical combination and product which usually result from a contact of these two elements. Another specimen is presented in the process of manufacturing a golden calf by merely casting gold ear-rings, finger-rings, &c., into the fire; and also Moses' invention for grinding the same gold into powder, and sprinkling it on the water, and compelling the people to drink it. No process is known in modern times by which gold can be ground to powder, nor for holding it in solution if ground and thrown into water. The specific gravity of all gold now in use causes it to sink to the bottom as soon as it is thrown into water. Bible chemistry seems to differ from natural chemistry. 16. _Pneumatics_.--Had Jehovah been acquainted with this science, he could not have become alarmed about having his kingdom invaded by the builders of Babel; for we learn, by an acquaintance with the principles of this science, that the air becomes so rarefied as we ascend, that we soon reach a point where human life must cease. Hence it was unnecessary to confound the language of the people in order to arrest the completion of the tower. They would have been compelled to desist before they had got many miles from the earth. 17. _Acoustics._--Moses must have been ignorant of this science, or presumed his readers would be, when he related the numerous cases of himself and Joshua and others reading and talking to two millions of people, some of whom must have been several miles distant. No human voice in modern times could reach one-half of such an audience.