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c representations of complex natural phenomena by means of lines on maps, such as the isothermals, which unite places of equal mean temperature, hypsometric lines, which unite places of equal hight, etc.; or depicting, by circumscribing lines or by color, regions of equal average temperature or rainfall, population, mortality, illiteracy, wealth, race, etc. The following names are used for lines drawn upon maps to connect places of equal conditions, as follows: — For an illustration, see Blodget's Climatology of the United States, Philadelphia, 1857. Isobarometric, having equal barometric pressure. Isocheimal, having same winter temperature. Isoclinal, indicating equal magnetic dip. Isocrymal, having same extreme of cold. Isodynamic, having same magnetic intensity. Isogcothermal, passing through points beneath the surface which have the same average heat. Isogonic, indicating equal variation of compass. Isohyclose, having same mean annual rainfall. Iso
4, 1873. 136,859PeasleeMar. 18, 1873. 140,406DupreJuly 1, 1873. 142,812PowellSept. 16, 1873. 142,819SpringerSept. 16, 1873. 143,955BondOct. 28, 1873. 143,969De WaruOct. 28, 1873. (Reissue.)5,689RobertsDec. 16, 1873. 145,841BuschmeierDec. 23, 1873. 148,047GoodrichMar. 3, 1874. 148,048GoodrichMar. 3, 1874. 150,787PowellMay 12, 1874. 154,113BaglinAug. 18, 1874. 154,485HowardAug. 25, 1874. 158,231BallouDec. 29, 1874. (Reissue.)6,306PowellFeb. 23, 1875. 6. Hemmers. 10,386BlodgetJan. 3, 1854. 12,826OdiorneMay 8, 1855. 14,283ChapinFeb. 19, 1856. 15,402BoyesJuly 22, 1856. 17,224MarstonMay 5, 1857. 20,245SerrellMay 11, 1858. 20,695BoydJune 29, 1858. 21,355OdiorneAug. 31, 1858. 23,079ClemonsMar. 1, 1859. 24,088Barnum et al.May 24, 1859. 25,715Blake et al.Oct. 11, 1859. 26,207SerrellNov. 22, 1859. 27.805HowellApr. 10, 1860. 28,889MitchellJune 26, 1860. 31,602HowellMar. 5, 1861. 31,645MarshMar. 5, 1861. 31,878DownerApr. 2, 1861. 32,035WhitcombApr. 9, 1861