application was at first fluctuating and uncertain; it gained strength
as I proceeded and soon became so ardent and eager that the stars often
disappeared in the light of morning whilst I was yet engaged in my
laboratory.

As I applied so closely, it may be easily conceived that my progress
was rapid. My ardour was indeed the astonishment of the students, and
my proficiency that of the masters. Professor Krempe often asked me,
with a sly smile, how Cornelius Agrippa went on, whilst M. Waldman
expressed the most heartfelt exultation in my progress. Two years
passed in this manner, during which I paid no visit to Geneva, but was
engaged, heart and soul, in the pursuit of some discoveries which I
hoped to make. None but those who have experienced them can conceive
of the enticements of science. In other studies you go as far as
others have gone before you, and there is nothing more to know; but in
a scientific pursuit there is continual food for discovery and wonder.
A mind of moderate capacity which closely pursues one study must
infallibly arrive at great proficiency in that study; and I, who
continually sought the attainment of one object of pursuit and was
solely wrapped up in this, improved so rapidly that at the end of two
years I made some discoveries in the improvement of some chemical
instruments, which procured me great esteem and admiration at the
university. When I had arrived at this point and had become as well
acquainted with the theory and practice of natural philosophy as
depended on the lessons of any of the professors at Ingolstadt, my
residence there being no longer conducive to my improvements, I thought
of returning to my friends and my native town, when an incident
happened that protracted my stay.

One of the phenomena which had peculiarly attracted my attention was