explain an anomaly: The coldest
season during the whole period, embraced in the following tables, is that
of 1812. This occurs during the decrease of spots, and the warm half of
the decade. Turning to the table of volcanic action, and of earthquakes,
found in the Report of the British Association for 1854, we find that year
was remarkable for earthquakes in the United States and South America. In
December, 1811, earthquakes commenced in the valley of the Mississippi,
Ohio, and Arkansas, felt also at places in Tennessee, Kentucky, Missouri,
Indiana, Virginia, North and South Carolina, Georgia, and Florida, though
not so severely east of the Alleghanies, _which continued until 1813_.
About the same time they commenced in Caraccas, and, in March, 1812,
became severe over the greater portion of the northern section of South
America, and in the Atlantic. No such general and continued succession of
earthquakes occurred during the other periods embraced in the tables, and
the mean of the following five years was very low, embracing the memorable
cold summer of 1816.

+---------------------------------------------------------------+
| Cold Period. | Warm Period. | Cold Period. | Warm Period. |
|---------------|---------------|---------------|---------------|
|1786 48 deg..53 |1791 48 deg..963|1796 48 deg..678|1801 50 deg..432|
|1787 47 deg..88 |1792 48 deg..44 |1797 48 deg..135|1802 50 deg..794|
|1788 47 deg..676|1793 50 deg..96 |1798 49 deg..471|1803 50 deg..24 |
|1789 47 deg..68 |1794 50 deg..768|1799 48 deg..291|1804 48 deg..328|
|1790 46 deg..53 |1795 50 deg..173|1800 49 deg..989|1805 50 deg..792|
|---------------|---------------|---------------|---------------|
|Mean of | | | |
|period 47 deg..659|Mean 49 deg..901|Mean 48 deg..910|Mean 50 deg..117|
|---------------|---------------|---------------|---------------|
|---------------|---------------|---------------|---------------|
|1806 47 deg..982|1811 50 deg..76 |1816 47 deg..113|1821 48 deg..15 |
|1807 48 deg..132|1812 45 deg..28 |1817 46 deg..277|1822 49 deg..81 |
|1808 49 deg..485|1813 47 deg..702|1818 48 deg..009|1823 47 deg..58 |
|1809 47 deg..92 |1814 48 deg..279|1819 50 deg..75 |1824 49 deg..25 |
|1810 49 deg..001|1815 47 deg..607|1820 48 deg..70 |1825 50