e
central apex has not been the highest, and these deviations, with some
of a minor character, form the exceptions alluded to. This type only has
reference to London and the south-eastern parts of England; proceeding
westward, north-westward, and northward, the symmetrical character of
this type is considerably departed from; each locality possessing its
own type of the barometric movements during November. The desiderata in
immediate connexion with the November movements, as observed in the
southern and south-eastern parts of England, that present themselves,
are--the determination of the types for November, especially its middle
portion, as exhibited on the oceanic surface within an area comprised
between the 30th and 60th parallels, and the 1st and 40th meridians
west. Vessels sailing within this area may contribute greatly to the
determination of these types by making observations at intervals of
three hours from the 1st of November to the 7th or 8th of December. The
entire period of the great symmetrical wave of November will most
probably be embraced by such a series of observations, as well as the
annual depression of the 28th. For the elevation of the 25th of December
the three-hourly observations should be commenced on the 21st, and
continued until the 3rd or 4th of the succeeding January.

With respect to the great wave of November, our knowledge of it would be
much increased by such a series of observations as mentioned above,
being made on board surveying and other vessels employed off Scotland
and Ireland; vessels navigating the North Sea; vessels stationed off the
coasts of France, Spain, Portugal, and the northern parts of Africa, and
at all our stations in the Mediterranean. In this way the area of
examination would be greatly enlarged, and the _differences_ of the
curves more fully elucidated; and this extended area of observation is
the more desirable, as there is some reason to believe that the line of
greatest symmetry _revolves_ around a fixed point, most probably the
nodal point of the great European systems.

It is highly probable that movements of a somewhat similar character,
although presenting very different curves, exist in the southern
hemisphere. The November wave is more or less associated with storms. It
has been generally preceded by a high barometer and succeeded by a low
one, and this low state of the barometer has been accompanied by stormy
weather. We are therefore prepared to seek