and other massive corals, where dredging is impracticable; to this
succeeds a belt of dead shells and small fragments of coral; and the
remainder of the channel is tenacious mud, in which I found nothing of
interest.

LEAVE MAURITIUS.

After a pleasant stay of twelve days, we left Mauritius, on May 17th, as
soon as the last set of sights for rating the chronometers had been
obtained, and in due time rounded the north end of the island to a light
wind off the land. In the first watch a distant light was conjectured,
with some degree of probability, to proceed from the well-known active
volcano of the Island of Bourbon.

During our stay at Port Louis, Captain Stanley had complied with a
requisition from the Commissariat to take some specie to Hobart Town,
consequently his previous intention of proceeding to Sydney, by way of
King George Sound, was abandoned.

On May 24th (our noon position being in latitude 28 degrees 1 minute
South, and longitude 67 degrees 30 minutes East) we tacked to the
South-West, having found the impracticability of making a straight course
for Cape Leeuwin without first getting well to the southward, and in due
time we reached the latitudes where westerly winds prevail, and were
enabled to proceed onward on our course.

TRY FOR DEEP-SEA SOUNDINGS.

On June 14th, when in latitude 40 degrees 45 minutes South, and longitude
123 degrees 23 minutes East, the occurrence of a calm during the