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Southern Medical and Surgical Journal - Georgia Regents University

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1859.] Climate to the Consumptive, &e. 731Humboldt.Its mean summer temperature is four <strong>and</strong> twentyfivehundredths degrees, (4°.25) higher than that of San Francisco;<strong>and</strong> three <strong>and</strong> eighty-eight hundredths degrees, (3°.88)higher than that of Fort Humboldt.Let us recapitulate ;from San Francisco, lat. 37°.48', northward2°.58' to Fort Humboldt, we observe a continuation ofthe same reduced monthly mean temperatures, with a strictparallelism throughout the dry season. To this point, the refrigeratinginfluence appears to be about the same. Progressing1°.58 / farther northward to Fort Orford, Ave observe a sudden<strong>and</strong> material increase of 2°.70 per month, over Fort Humboldtfor the summer season ;<strong>and</strong> from June to September, anaverage monthly increase of 2°.49 ;also a higher mean summertemperature by 2°.2o. Then continuing 3°.27' farther up toAstoria, we have an elevation of 1°.66 per month, over FortOrford, for the summer ; <strong>and</strong> a monthly average of 1°.05, fromJune to September. Hence we see within a distance of twodegrees of latitude, a sudden elevation of temperature amountingto 2°. 70 per month for the summer. And within five <strong>and</strong>a-halfdegrees of latitude, a mean monthly elevation of 4°.36 forthe summer over Fort Humboldt, <strong>and</strong> a difference in the summermeans of 3°.88. To what may this difference of temperaturewithin so short a distance be attributed ?Now perhaps we are better able to locate the northern edgeof this cold current, <strong>and</strong> to appreciate the point near which itsdirect effects cease, <strong>and</strong> where those ofsimple proximity begin.Fort Humboldt certainly falls within the range of its region ofcontact, for the slight <strong>and</strong> mere nominal differences that existbetween it <strong>and</strong> places five or six degrees of latitude farther south,afford positive proof of the fact. That it extends any distanceabove this point, is exceedingly problematical, for an advanceof not quite two degrees of latitude, gives a much greater- differenceof temperature, than has been noted for at least six degreessouth from that point. And advancing five degrees from thispoint, such differences are observed as point to an almost entireabsence of its influences, direct or indirect. It is likely that itsproximity to the coast off Fort Orford, largely affects its temperaturedistribution, <strong>and</strong> prevents the more material <strong>and</strong> increaseddifferences, which would otherwise occur between it <strong>and</strong> Fort

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