237. A spiritual angel draws out and calls forth from the sense of the letter of the Word what is spiritual, and a celestial angel what is celestial, because these meanings are in accord with the nature of the angel and are homogeneous therewith. The truth of this can be illustrated by like things in the three kingdoms of nature, the animal, the vegetable, and the mineral. In the Animal Kingdom: From the food, when it has become chyle, the blood-vessels draw out and call forth their blood, the nervous fibers their juice, and the substances which are the origins of fibers, their spirit. In the Vegetable Kingdom: A tree with its trunk, branches, leaves, and fruit stands on its root, and out of the soil by means of its root it draws out and calls forth a grosser juice for the trunk, branches, and leaves, a purer for the pulp of the fruit, and the purest for the seeds within the fruit. In the Mineral Kingdom: In certain places in the bosom of the earth there are veins impregnated with gold, silver, copper, and iron; from the exhalations and effluvia out of the rocks, the gold, the silver, the copper, and the iron draw each its own element, the watery element conveying these round about.