Advertisements" (Lond. 1616) shows: "Wherefore the round Loadstone
is significantly termed by Doct. Gilbert Terrella, that is, a
little, or rather a very little Earth: For it representeth in an
exceeding small model (as it were) the admirable properties
magneticall of the huge Globe of the earth" (op. cit, p. 55).
Gilbert set great store by his invention of the terrella, since it
led him to propound the true theory of the mariners' compass. In
his portrait of himself which he had painted for the University of
Oxford he was represented as holding in his hand a globe inscribed
terella. In the Galileo Museum in Florence there is a terrella
twenty-seven inches in diameter, of loadstone from Elba, constructed
for Cosmo de' Medici. A smaller one contrived by Sir Christopher
Wren was long preserved in the museum of the Royal Society (Grew's
"Rarities belonging to the Royal Society," p. 364). Evelyn was
shown "a pretty terrella described with all ye circles and skewing
all y magnetic deviations" (Diary, July 3rd, 1655).]

which I had hoped he had sent me, but to my trouble I find it is to
present from him to my Lord Sandwich, but I will make a little use of it
first, and then give it him.

3rd. Up, being well pleased with my new lodging and the convenience of
having our mayds and none else about us, Will lying below. So to the
office, and there we sat full of business all the morning. At noon I home
to dinner, and then abroad to buy a bell to hang by our chamber door to
call the mayds. Then to the office, and met Mr. Blackburne, who came to
know the reason of his kinsman (my Will) his being observed by his friends
of late to droop much. I told him my great displeasure against him and
the reasons of it, to his great trouble yet satisfaction, for my care over
him, and how every thing I said was for the good of the fellow, and he