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The variation of compass at Temple Block in 1849 was 15° 47′ 23″, and in 1860 it was 15° 54′, a slow progress toward the east. (In the Wind-River Mountains, as laid down by Colonel Frémont in 1842, it was E. 18°.) In Fillmore Valley it is now 18° 15′, and three years ago was about 17° east; the rapid progression to the east is ac-