The Chicago Manual of Style 14th ed. says: 5.37 An adverbial phrase at the beginning of a sentence is frequently followed by a comma.
AND 5.38 The comma is usually omitted after short introductory adverbial phrases unless misreading is likely. I guess you can choose. Tim Kuntz > >>3) Throughout that passage there is a distinct absence of commas, >>which are used to separate subordinate clauses from the rest of the >>sentence. > > > Commas are also used to separate introductory phrases. As "Throughout > that > passage" is an introductory phrase preceding the main clause of the > sentence, it should also be separated by a comma. > To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
