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Rh. The two following days we continued running along the bank of Sofala, in twelve fathoms. It appears evident, that this bank has been thrown up by the violence of the south-east winds, which generally prevail, blowing in direct opposition to the currents of many rapid rivers which here flow into the sea. The shoals appear by the old charts to have perceptibly increased, and it is probable, like the sands at the mouth of the Ganges, which they much resemble, that they are liable to shift, so that too much caution cannot be used in sailing up the coast. No ship should venture into less than twelve fathoms, in which depth she may traverse the Bank in perfect safety. The Portuguese are so well aware of the dangers of approaching nearer, that they never let their ships attempt it, but carry on the whole intercourse with Sofala by small coasting vessels from Mosambique.

The number of whales we met with on the Bank was very considerable. At times we had twenty or thirty in sight; some of them passing close by the vessel, others darting away, making a snorting noise, and throwing up the water like a fountain. At different times they seemed to be pursuing each other, wildly rolling and tumbling about, occasionally rising erect out of the water, shining like bright pillars of silver, then falling on their backs, and flapping their enormous fins violently on the surface, with a noise somewhat resembling the report of a cannon. It occurred to us that during this period, they were probably engaged in generating their species, on which account, it is not improbable, that at this particular season only they frequent the Bank; but whatever might have been the occasion of their assemblage, it was an uncommon and interesting sight, to see these