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Greenhow obtained from the Hydrographical Office at Madrid the report of Captain Bruno Heceta's voyage in 1775, when he sighted the mouth of a river supposed to be the Columbia.
On the 17th February the two corvettes once more cast anchor off Hobart's Town, and on the 25th set sail again for New Zealand, where they completed the hydrographical surveys of the Uranie.
Lislet Geoffroy, a mulatto, was an officer of Artillery and guardian of the Depôt of Maps and Plans of the Isle of France. He was a correspondent of the French Academy of Sciences, to whom he regularly transmitted meteorological observations, and sometimes hydrographical journals. His map of the Isles of France and Reunion is considered the best map of those islands that has appeared.
The Hydrographical Examiner makes a general tour to the different ports, where he interrogates the pupils in arithmetic, algebra, geometry, statics, and navigation. According to these examinations, they are admitted to the rank of aspirons de marine or midshipmen, captains of merchant-ships for long voyages, masters of coasting-vessels, pilots, &c,
I have heard many times from her on the subject, and always done my utmost to quiet her mind and soothe her apprehensions. "All your letters to me and to the Admiralty have, I believe, been safely received. Your last, containing the last sheet of your chart, I forwarded to the Hydrographical Office at the Admiralty, as you desired.
If they were constructed upon such a scale as to admit of the free passage of the water through them, in either direction, as the prevailing winds should impel it, they would exercise a certain influence on the coast currents, which are important as hydrographical elements, and also as producing abrasion of the coast and a drift at the bottom of seas, and hence they would be entitled to rank higher than simply as artificial means of transit.
D'Urville made no pause in the hydrographical survey of the northern island of New Zealand, keeping up daily communication with the natives, who brought him supplies of pigs and potatoes. According to their own statements, the tribes were perpetually at war with one another, and this was the true cause of the decrease in the population of these islands.
On this subject, however, I shall not dwell, but refer those who desire particular information to the charts and Hydrographical Memoir. Towards evening, I again ran down to the southwest point of the island of Mindoro, and sent a letter on shore to the pueblo, with directions to have it put on board the tender, when she should arrive.
The stony fragments dispersed irregularly through the till usually belong, especially in mountainous countries, to rocks found in some part of the same hydrographical basin; but there are regions where the whole of the boulder clay has come from a distance, and huge blocks, or "erratics," as they have been called, many feet in diameter, have not unfrequently travelled hundreds of miles from their point of departure, or from the parent rocks from which they have evidently been detached.
He studied three maps of the region as he rattled along in the south-bound train, and devoted the rest of the time to getting an outline of its history: so that his nephew found him but an indifferent companion. "I suppose there are authorized maps and charts, geographical, hydrographical, and topographical, issued by the government, and to be seen at the libraries.
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