
          there in the drawer of the table in the Hall.
Have you procured the book from Hopkins
which you mentioned to me some time since
I would like to look at it for a short time
when I come to the city.

That [?] of amalgamated [?] is
[?] of great practical importance. I intend
to see it in some experiments relative to the
size of wire required to transmit all the electricity
which can be generated by a given quantity
of Tin & copper For this purpose a number of
of Tin & copper plates of the same size but
united by wires of different thickness
may be plunged into the new solution of
and if the zinc be amalgamated the whole
action will alone be due to the conduction
of the wire which unites [crossed out: the] the zinc with the copper
by weighing the different plates we can
determine how much zinc has been dissolved
in a given time & thus estimate the amount
of galvanic action

With the highest
Esteem

Yours sincerely

Jos. Henry

Dr. J. Torrey
        