[28] Yet in the days of Erasmus of Rotterdam the theologians were making great ado over this knotty problem. [29] This confession Cornelius Agrippa makes in his "Occult Philosophy." Theophrastus Paracelsus and others were less modest. [30] Thus reasoned, as late as the middle of the sixteenth century, Borrichius (Olaf Borch), who was professor in chemistry at the University of Copenhagen and wrote a book upon the wisdom of the Egyptian Hermes. [31] Agrippa: "De Occulta Philosophia," 1. I., c. 24. [32] We have found in a "_Magia Divina_" the following directions for accomplishing a _perpetuum mobile naturæ_, the efficacy of which we leave for the reader to decide. "During the twelve nights after Christmas 1-1/2 measures of dew are collected from fruit-trees, and preserved well enclosed. In the month of March dew is again collected from both fruit-trees and meadows and is preserved in another phial. Dew collected in May is poured in a third and rain of a thunderstorm during the summer in a fourth. Thereupon the contents of the four phials are mixed and one measure of it is poured into a great transparent glass retort where, well covered, it must remain a month until it becomes foul. Put it then over fire and subject to heat of the second degree. When sufficiently distilled a substance thick as honey is left. In this residue are poured four grains of astral tincture. The mixture is exposed to a heat of the first degree, by which it is converted into a thick, jet-black lump which again is dissolved, forming below an ink-like fluid, and above a vapor, in which many colors and figures are seen. These soon disappear, and every thing is changed into water, which begins to turn green, and green palaces, constantly enlarging, and mountains and lovely pastures appear, while the water is diminished more and more. When now you find that no more dew rises from the earth within the glass, take the water which you received from the distillation, mix with it a drachm of astral tincture and pour an ounce of this mixture into the glass bulb. Then every thing begins again to live and grow. Add every month an ounce of this mixture. If then the glass ball is well closed, and is not stirred, a vapor gradually arises, and is condensed into two shining stars, like the sun and the moon, and like the latter, one of these stars waxes and wanes; and all the phenomena of nature, thunder, lightning, hail, rain, snow and dew, will appear in your glass ball as in the real world around you. All this will happen if you keep the great Creator before your eyes and in your heart, and if you conceal from the wicked world this great secret."