ce of the oil, and the water under it will be violently
agitated.

_Another curious Experiment with Oil and Water._

Drop a small quantity of oil into water agitated by the wind; it will
immediately spread itself with surprising swiftness upon the surface,
and the oil, though scarcely more than a tea-spoonful, will produce an
instant calm over a space several yards square. It should be done on
the windward side of the pond or river, and you will observe it extend
to the size of nearly half an acre, making it appear as smooth as a
looking-glass. One remarkable circumstance in this experiment is the
sudden, wide, and forcible spreading of a drop of oil on the surface
of the water; for if a drop of oil be put upon a highly polished
marble table, or a looking-glass, laid horizontally, the drop remains
in its place, spreading very little, but when dropped on water it
spreads instantly many feet round, becoming so thin as to produce the
prismatic colours for a considerable space, and beyond them so much
thinner as to be invisible, except in its effect in smoothing the
waves at a much greater distance. It seems as if a repulsion of its
particles took place as soon as it touched the water, and so strong as
to act on other bodies swimming on the surface, as straw, leaves,
chips, &c., forcing them to recede every way from the drop, as from a
centre, leaving a large clear space.

_Remarkable Effects on the visual Nerves, by looking through
differently-coloured Glasses._

After looking through green spectacles, the white paper of a book
will, on first taking them off, appear to have a blush of red; and
after looking through red glasses, a greenish cast. This seems to
intimate a relation between green and red, not yet explained.

_Weather Table._

--------------------+---------------------+------------------------
NEW AND FULL MOON. | SUMMER. | WINTER.
--------------------+---------------------+------------------------
If the new or full | |
moon enters into | |
the first or last | |
quarter of the | |
hour of 12 at noon | Very rainy | Snow and rain.
| |
If between the | |
hours of | |
(P.M.) 2 and 4 | Changeable | Fair and mild.
4 and 6 | Fair