Still we must admit that of this supreme God our forefathers had only a somewhat vague conception; and to many of them he was almost wholly unknown. Their god was a natural human god, a person. There can be no genuine poetry without impersonation, and a perfect system of mythology is a finished poem. Mythology is, in fact, religious truth expressed in poetical language. It ascribes all events and phenomena in the outward world to a personal cause. Each cause is some divinity or other—some god or demon. In this manner, when the ancients heard the echo from the woods or mountains, they did not think, as we now do, that the waves of sound were reflected, but that there stood a dwarf, a personal being, who repeated the words spoken by themselves. This dwarf had to have a history, a biography, and this gave rise to a myth. To our poetic ancestors the forces of nature were not veiled under scientific names. As Carlyle truthfully remarks, they had not yet learned to reduce to their fundamental elements and lecture learnedly about this beautiful, green, rock-built, flowery earth, with its trees, mountains and many-sounding waters; about the great deep sea of azure that swims over our heads, and about the various winds that sweep through it. When they saw the black clouds gathering and shutting out the king of day, and witnessed them pouring out rain and ice and fire, and heard the thunder roll, they did not think, as we now do, of accumulated electricity discharged from the clouds to the earth, and show in the lecture room how something like these powerful shafts of lightning could be ground out of glass or silk, but they ascribed the phenomenon to a mighty divinity—Thor—who in his thunder-chariot rides through the clouds and strikes with his huge hammer, Mjolner. The theory of our forefathers furnishes food for the imagination, for our poetical nature, while the reflection of the waves of sound and the discharge of electricity is merely dry reasoning—mathematics and physics. To our ancestors Nature presented herself in her naked, beautiful and awful majesty; while to us in this age of Newtons, Millers, Oersteds, Berzeliuses and Tyndalls, she is enwrapped in a multitude of profound scientific phrases. These phrases make us flatter ourselves that we have fathomed her mysteries and revealed her secret workings, while in point of fact we are as far from the real bottom as our ancestors were. But we have robbed ourselves to a sad extent of the poetry of nature. Well might Barry Cornwall complain: O ye delicious fables! where the wave And the woods were peopled, and the air, with things So lovely! Why, ah! why has science grave Scattered afar your sweet imaginings?