Born in
Salisbury, Massachusetts, Morrill graduated from
Bowdoin College in 1834 and
read law to enter the bar in 1836. He was in private practice in
Murfreesboro, Tennessee from 1836 to 1839, in
Clarksville, Texas from 1839 to 1856, and in
Austin, Texas from 1856 to 1868. On June 9, 1847, Amos Morrill purchased the property
The Grove in
Jefferson, Texas and built a log cabin there, which he used during his time in Jefferson. Morrill sold the property to Caleb Ragin and his wife Sarah on March 20, 1855. He was a justice of the
Texas Supreme Court from 1868 to 1870, returning to private practice in Austin from 1870 to 1872. ==Federal judicial service==