shall be added unto you.” Perhaps it will be thought, even at this preliminary stage of citation, that there is much to be said for the physical theory of alchemy. A particular appeal is, however, made to the celebrated “Canons of Espagnet,” and to the following passage:--“The light of this knowledge is the gift of God, which by his freeness he bestoweth upon whom he pleaseth. Let none, therefore, set himself to the study hereof, until, having cleared and purified his heart, he devote himself wholly unto God, and be emptied of all affection to things impure. Those that are in public honours and offices, or be always busied with private and necessary occupations, let them not strive to attain to the top of this philosophy; for it requireth the whole man; and being found, possesseth him, and being possessed, challengeth him from all long and serious employments, esteeming all other things as strange unto him, and of no value. Let him that is desirous of this knowledge clear his mind from all evil motions, especially pride, which is abomination to heaven, and the gate of hell. Let him be frequent at prayers and charitable; have little to do with the world; abstain from too much company-keeping, and enjoy constant tranquillity, that the mind may be able to reason more freely in private, and be more highly lifted up; for unless it be kindled with a beam of divine light, it will hardly be able to penetrate the hidden mysteries of truth.... A studious Tyro of a quick wit, constant mind, inflamed with the love of philosophy, very quick in natural philosophy, of a pure heart, perfect in manner, mightily devoted to God, even though ignorant of chemistry, may enter with confidence the highway of Nature, and peruse the books of the best philosophers. Let him seek out an ingenious companion for himself, and not despair of accomplishing his desire.” Here Hitchcock points out that the operation is obviously not chemical, for the chief instrument is determined and concentrated thinking on the loftiest intellectual planes. The inference that skill in natural philosophy is indispensable, is contradicted by the counter-statement that ignorance of chemistry is not necessarily a source of failure. In this connection, it must be remembered that the distinction between alchemy and chemistry can scarcely be said to have existed at the period of Espagnet, and the statement would at first sight seem almost equivalent to asserting that it was unnecessary to be versed in the properties of metals to accomplish the _magnum opus_. “Let a lover of truth,” continues the author of the Canons, “make use of but a few philosophers, but of best note and experienced truth; let him suspect things that are quickly understood, especially in mystical names and secret operations, for truth lies hid in obscurity; nor do philosophers ever write more deceitfully than when plainly, nor ever more truly than when obscurely.”