two great systems of central Europe. The late Professor Daniell has
shown from the Manheim observations, that small undulations, having
their origin on the northern borders of the Mediterranean, have
propagated themselves northward, and in this manner, but in a smaller
degree, the waters of the Mediterranean have contributed to increase the
oscillation as well as the larger surface of the northern Atlantic. In
most of the localities of this great inland sea six-hourly observations
may suffice for this immediate purpose; but in sailing from Lisbon
through the Straits of Gibraltar, in the neighbourhood of Sicily and
Italy, and in the Grecian Archipelago, we should recommend the
three-hourly series, as marking more distinctly the effects resulting
from the proximity of land; this remark has especial reference to the
passage through the Straits of Gibraltar, where, if possible, hourly
observations should be made.


_The Indian and Southern Oceans. Outward and homeward bound._--On
sailing from the Cape of Good Hope to the East Indies, China, or
Australia, observations at intervals of three hours should be made until
the 40th meridian east is passed (homeward-bound vessels should commence
the three-hourly readings on arriving at this meridian). Upon leaving
the 40th meridian the six-hourly observations may be resumed on board
vessels bound for the Indies and China until they arrive at the equator,
when the readings should again be made at intervals of three hours, and
continued until the arrival of the vessels in port. With regard to
vessels bound for Australia and New Zealand, the six-hourly readings may
be continued from the 40th to the 100th meridian, and upon the vessels
passing the latter, the three-hourly readings should be commenced and
continued until the vessels arrive in port. Vessels navigating the
Archipelago between China and New Zealand, should make observations