by the wonderful properties it was said to possess, that I determined
to make some of the compound. We tested what we considered a very small
quantity, but this produced such terrible and unexpected results that we
became alarmed, the fact dawning upon us that we had a very large
white elephant in our possession. At 6 A.M. I put the explosive into
a sarsaparilla bottle, tied a string to it, wrapped it in a paper,
and gently let it down into the sewer, corner of State and Washington
Streets." The associate in this was a man whom he had found endeavoring
to make electrical apparatus for sleight-of-hand performances.

In the Boston telegraph office at that time, as perhaps at others, there
were operators studying to enter college; possibly some were already in
attendance at Harvard University. This condition was not unusual at one
time; the first electrical engineer graduated from Columbia University,
New York, followed up his studies while a night operator, and came out
brilliantly at the head of his class. Edison says of these scholars that
they paraded their knowledge rather freely, and that it was his delight
to go to the second-hand book stores on Cornhill and study up questions
which he could spring upon them when he got an occasion. With those
engaged on night duty he got midnight lunch from an old Irishman called
"the Cake Man," who appeared regularly with his wares at 12 midnight.
"The office was on the ground floor, and had been a restaurant previous
to its occupation by the Western Union Telegraph Company. It was
literally loaded with cockroaches, which lived between the wall and the
board running around the room at the floor, and which came after the
lunch. These were such a bother on my table that I pasted two strips
of tinfoil on the wall at my desk, connecting one piece to the positive
pole of the big battery supplying current to the wires and the negative
pole to the other strip. The cockroaches moving up on the wall would
pass over the strips. The moment they got their legs across both strips