Here, Jim, let me do that.
817. Use commas to set off appositives.
Hilda Kasper, the cateress, served the luncheon.
818. Use commas to set off geographical names which explain other geographical names.
He lived in Birmingham, Alabama, before he came here.
819. Use commas to set off the year as a part of a date.
In April, 1923, he went home.
The letter was dated February 2, 1910.
820. Use commas to set off absolute phrases.
The soldiers having rested, Hannibal ordered the army to start.