How difficult it is to go back in imagination to the days before men grasped the meaning of natural law! We take gravitation for granted but, when Newton first proclaimed its law, the artillery of orthodox pulpits was leveled against him in angry consternation. Said one preacher, Newton "took from God that direct action on his works so constantly ascribed to him in Scripture and transferred it to material mechanism" and he "substituted gravitation for Providence." [1] That preacher saw truly that the discovery of natural law was going to make a profound difference to religion. For ages men had been accustomed to look for the revelation of supernatural power in realms where they did not know the laws. And as men were tempted to look for the presence of God in realms where they did not know the laws, so in those realms they trusted God to do for them what they did not know how to do for themselves. Then men began discovering natural laws, and every time they laid their hands on a new natural law they laid their hands on a new law-abiding force and began doing for themselves things of which their fathers had never dreamed. Stories of old-time miracles are overpassed in our modern days. Did Aladdin once rub a magic lamp and build a palace? To-day, knowledge of engineering laws enables us to achieve results that would put Aladdin quite to shame. He never dreamed a Woolworth Tower. Did the Israelites once cross the Red Sea dry-shod? One thing, however, they never would have hoped to do: to cross under and over the Hudson River day after day in multitudes, dry-shod. Did an axe-head float once when Elisha threw a stick into the water? But something no Elisha ever dreamed of seeing we see continually: iron ships navigating the ocean as though it were their natural element. Did Joshua once prolong the day for battle by the staying of the sun? Yet Joshua could never have conceived an habitual lighting of the city's homes and streets until by night they are more brilliant than by day. Did Jericho's walls once fall at the united shout of a besieging people? Those childlike besiegers, however, never dreamed of guns that could blast Jerichos to pieces from seventy miles away. Huxley was right when he said that our highly developed sciences have given us a command over the course of non-human nature greater than that once attributed to the magicians.