instruments, and requested him to send me a list and an order to
the best London maker for such as he wanted. He transmitted the
following letter, which marks the progress of his knowledge, to be
forwarded to Messrs. Troughton and Sims, Fleet Street. I obtained
it very recently from that house.

March 20th, 1857.

SIRS,

I shall be much obliged by your executing the following order as
quickly as possible, and at your most reasonable prices.

1. One four-inch theodolite, best construction: 21 pounds.

2. One of Troughton's best reflecting circles, eight-inch radius,
divided on silver: 23 pounds.

3. One prismatic compass, three and a-half inch, with silver ring:
5 pounds 5 shillings.

4. One six-inch semicircular protractor, with Vernier: 3 pounds 3
shillings.

5. One glass plane artificial horizon, ordnance pattern: 4 pounds 4
shillings.

6. One brass rolling parallel ruler, two feet long; must not weigh
less than five pounds.