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A systematic treatise, historical, etiological and practical, on the principal diseases of the interior valley of North America - as they appear in the Caucasian, African, Indian, and Esquimaux (14580487638)
Summary
Identifier: systematictreati00drak (find matches)
Title: A systematic treatise, historical, etiological and practical, on the principal diseases of the interior valley of North America : as they appear in the Caucasian, African, Indian, and Esquimaux varieties of its population
Year: 1850 (1850s)
Authors: Drake, Daniel, 1785-1852
Subjects: Medical geography Medical climatology
Publisher: Cincinnati : Winthrop B. Smith & Co.
Contributing Library: University of Pittsburgh Library System
Digitizing Sponsor: Lyrasis Members and Sloan Foundation
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which lie in the same longitude, would fix it at 41° 22. On thewhole, we may, in the present state of our knowledge, say, that the isother-mal curve of mean temperature for the whole Valley meanders, from theAlleghany River to the Missouri River (the elevation being from six hun-dred to one thousand two hundred feet), between the forty-first and forty-second parallels; but seems, from the observations at Council Bluffs, to risehighest in the west. The western extremity of Lake Erie, and the southernend of Lake Michigan, dip into this zone; which, likewise, includes thenorthern part of Ohio and Indiana, cuts through the northern portion ofWest Pennsylvania, and of Illinois, and traverses the southern half of Iowa.To the north of this zone lies the colder, to the south, the warmer climatichalf of the Valley. It is worthy of remark, that this zone ranges nearlyec;uidistant between the Gulf of Mexico and Hudson Bay, and also betweenthe band of Equatorial Heat and the Pole of Cold. PLXIX
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PART ii.J INTERIOR VALLEY OF NORTH AMERICA. 531 CHAPTER III. ATMOSPHERIC PRESSURE OF THE INTERIOR VALLEY. SECTION I. : • INTRODUCTION. I. As the variations in the weight or pressure of the atmosphere, at thesame place, depend, directly or indirectly, on the temperature of the air,their study naturally follows that in which we have been engaged; and, inturn, prepares us for the study of our winds and weather, which are inti-mately connected with barometric oscillations. II. The difficulties and deficiencies which we meet, in this department ofour meteorology, are great; for, although a large proportion of the meteor-ologists, whose thermometrical observations were quoted in the last chapter,have kept barometrical registers, but few have made allowance for the effectof variations of temperature, on the mercurial column, or for the influence onits hight, of the capillary attraction of the tube; whereby their records arenot a true expression of the weight of the atmosphere. From the for
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