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Southern Medical and Surgical Journal - Georgia Regents University

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736 Doughty. An Essay on the Adaptation of [November,Humboldt, south five degrees of latitude, their influence issuch as to subdue or overwhelm the ordinary continentalinfluences by reducing the mean of May below April, <strong>and</strong>in the middle of the dry season, that of August below July.So that twice during the dry season, this inordinate reductionof temperature happens, <strong>and</strong> indeed it is not improbable thatthe same effect would be produced as far south as San Diego,if it was not for the mere latitude of this place, <strong>and</strong> their ownincrease of temperature in their course southward. Certainlyif they extended as high up as Fort Orford, with latitude intheir favor, they ought to manifest at least an equal degree ofinfluence. Their withdrawal, on the other h<strong>and</strong>, producesgreater abruptness, <strong>and</strong> a greater increase of temperature for theseason, than at the south.*Upon an inspection of the general range of the monthlymean temperatures for the entire region, the Willamette Valleyshows the greatest variation in their relative position:the range for March transcends largely that of the far interiorpost in New Mexico, namely, Fort Defiance, <strong>and</strong> equalsmany of those variable posts in the southern part ef the easternslope of the United States, <strong>and</strong> around the Gulf. Even postsin the Columbia Valley, as Fort Dalles, present a much fairerrecord, for the mean range for the season there is only 3°. 84,whilst here it is 8°.09. The coast, however, as usual, presentsby far the least variation in this respect, for the greatest rangeis only 4°.52, which took place in May ; <strong>and</strong> it has an averagefor the season of only 2°.9i. Indeed for the limited period ofobservation here, the coast of Oregon, as exhibited in the rangeof the monthly mean temperatures at this post, is superior tothat of California. For March here gives a difference betweenthe highest <strong>and</strong> lowest means of only 3°.31, whilst at SanFrancisco it is 6°.82 : <strong>and</strong> the mean of the entire season is only2°.91, that at the latter place, being 3°.76. This superiority* It is as well to state here as elsewhere, that the temperature of the watersoff this part of the Pacific coast, are perhaps of a more or less uniform temperatureall the year round, <strong>and</strong> also that the waters themselves constitute a part ofthe same current which has been seen to prevailduring the wet season of California.If so, they are probably at or about the same temperature of the latter.So that we have at this point, <strong>and</strong> doubtless farther northward also, an unchangingtemperature of the sea at all times.

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