in vessels, are so changed by means of proper instruments as to produce
certain determinate effects, and at the same time discover the causes
thereof, for the service of the various arts.”

Now, it is amply evident that, long before the various known facts could
be collected and welded into one compact whole as a science, there must
have existed great store of intellectual wealth, as well as mere
hereditary practical knowledge of the various chemical facts.

I do not think it will be disputed that, until comparatively recent
times, technical knowledge has constantly been in advance of theory, and
that it is not too much to conclude that, no matter where we first find
actual records of our science, its natal day must have long before
dawned. Even in our day, when theoretical science, as applied to
chemistry, has made such immense strides, how often do we find that it
is only now that theory comes in to explain facts, known as such long
previous, and those engaged in practical chemical work know how much
technical knowledge is still unwritten, and what may even be called
traditionary.

I purpose taking up the subject from this point of view, and attempting,
with what little ability I can, to follow back to a still more remote
period than that of Geber and the Arabian school of philosophers the
traces of what has often been called the divine art.

An aspect of the question that has often presented itself to me is this,
that the history of what we call our world extends over some 4000 years
before Christ and 1878 years since, so that, according to the usually
accepted idea, if chemistry originated in Arabia in the eighth century,
it was not known during say the first 5000 years of the world’s history,