[CHAPTER II]
THE THEORY OF PHYSICAL ALCHEMY
Supposed Proofs of Transmutation.
§ 14. It must be borne in mind when reviewing the theories of the alchemists, that there were a number of phenomena known at the time, the superficial examination of which would naturally engender a belief that the transmutation of the metals was a common occurrence. For example, the deposition of copper on iron when immersed in a solution of a copper salt (e.g., blue vitriol) was naturally concluded to be a transmutation of iron into copper,[21] although, had the alchemists examined the residual liquid, they would have found that the two metals had merely exchanged places; and the fact that white and yellow alloys of copper with arsenic and other substances could be produced, pointed to the possibility of transmuting copper into silver and gold. It was also known that if water (and this is true of distilled water which does not contain solid matter in solution) was boiled for some time in a glass flask, some solid, earthy matter was produced; and if water could be transmuted into earth, surely one metal could be converted into another.[22] On account of these and like phenomena the alchemists regarded the transmutation of the metals as an experimentally proved fact. Even if they are to be blamed for their superficial observation of such phenomena, yet, nevertheless, their labours marked a distinct advance upon the purely speculative and theoretical methods of the philosophers preceding them. Whatever their faults, the alchemists were the forerunners of modern experimental science.
[21] Cf. The Golden Tract concerning the Stone of the Philosophers (The Hermetic Museum, vol. i. p. 25).
[22] Lavoisier (eighteenth century) proved this apparent transmutation to be due to the action of the water on the glass vessel containing it.
The Alchemistic Elements.
§ 15. The alchemists regarded the metals as composite, and granting this, then the possibility of transmutation is only a logical conclusion. In order to understand the theory of the elements held by them we must rid ourselves of any idea that it bears any close resemblance to Dalton’s theory of the chemical elements; this is clear from what has been said in the preceding chapter. Now, it is a fact of simple observation that many otherwise different bodies manifest some property in common, as, for instance, combustibility. Properties such as these were regarded as being due to some principle or element common to all bodies exhibiting such properties; thus, combustibility was thought to be due to some elementary principle of combustion—the “sulphur” of the alchemists and the “phlogiston” of a later period. This is a view which à priori appears to be not unlikely; but it is now known that, although there are relations existing between the properties of bodies and their constituent chemical elements (and also, it should be noted, the relative arrangement of the particles of these elements), it is the less obvious properties which enable chemists to determine the constitution of bodies, and the connection is very far from being of the simple nature imagined by the alchemists.