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Updated: June 7, 2025
The extreme high temperature of the interior division equals that of points lying a dozen degrees south in other longitudes, and the desiccated winds from the west, as they blow over this parched and heated surface, have their aridity rather than their humidity increased, as would be the case in other circumstances; and not till they reach within perhaps five hundred miles of the eastern boundary of this continental division do they increase in humidity, as indicated by the rain-fall, which rises in quantity from the low minimum of seven and a half cubic inches per annum in the "great basin," and fifteen on the "great plains," to about twenty in Dakota territory and twenty-five in Minnesota, the eastern limit of this continental climate.
My instructions, in substance, informed me that the main object of the Expedition was that of determining the latitudes and longitudes of the Northern Coast of North America, and the trending of that Coast from the Mouth of the Copper-Mine River to the eastern extremity of that Continent; that it was left for me to determine according to circumstances, whether it might be most advisable to proceed, at once, directly to the northward till I arrived at the sea-coast, and thence westerly towards the Copper-Mine River; or advance, in the first instance, by the usual route to the mouth of the Copper-Mine River, and from thence easterly till I should arrive at the eastern extremity of that Continent; that, in the adoption of either of these plans, I was to be guided by the advice and information which I should receive from the wintering servants of the Hudson's Bay Company, who would be instructed by their employers to co-operate cordially in the prosecution of the objects of the Expedition, and who would provide me with the necessary escort of Indians to act as guides, interpreters, game-killers, &c.; and also with such articles of clothing, ammunition, snow-shoes, presents, &c., as should be deemed expedient for me to take.
Observations of the eclipses of the satellites have not afforded any indications of the actual existence of such a libratory motion, so that the relations between the mean motions and mean longitudes may be presumed to be always rigorously true. Translator. Translator. Method for determining the orbits of comets.
They gave the longitudes of the planets, the position of the sun, the time of rising and setting, the prediction of eclipses, etc. They have, of course, gradually increased in accuracy as the tables of the celestial motions were improved from time to time.
If each of these southern nations, the Spanish and Portuguese for instance, actually use a meridian of their own, the practice must lead to great confusion. If their navigators do not do so but refer their longitudes to the meridian of Greenwich, then their almanacs must be as good as useless.
Certes I would gladly set down, with the names and number of the cities, all the towns and villages in England and Wales with their true longitudes and latitudes, but as yet I cannot come by them in such order as I would; howbeit the tale of our cities is soon found by the bishoprics, sith every see hath such prerogative given unto it as to bear the name of a city and to use Regaleius within her own limits.
Agathodæmon, an artist of Alexandria, observing the request in which his work was held, prepared a set of maps to illustrate it, in which all the places mentioned in it were laid down, with the latitudes and longitudes he assigned them.
Mr Vernon, the clergyman passenger I spoke of, told me an anecdote of Galileo, showing that, great as he was as an astronomer, he might make a great mistake by forgetting to take all points into consideration. He fancied that he had discovered a method of determining longitudes at sea by observing the eclipses of Jupiter's satellites.
Although, therefore, much remains yet to be accomplished by maritime expeditions, towards the extension and correction of our geographical knowledge, so far as the bearings of the coast, and the latitudes and longitudes of various places are concerned, there seems no room for what may properly and strictly be called discovery, at least of any thing but small and scattered islands.
The post goes and comes and ferrets through all the eighty-six departments. Difficulties only arouse the genius of the clerks, who may really be called men-of-letters, and who set about to search for that unknown human being with as much ardor as the mathematicians of the Bureau give to longitudes. They literally ransack the whole kingdom.
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