(2 syl.). Persons in the court from whom the sheriff or his
clerk makes selections to supply the place of jurors who have been
empanelled, but are not in attendance. It is the first word of the
Latin sentence which provides for this contingency. (Tales de
“To serve for jurymen or tales.”
Butler: Hudibras, part iii. 8.
To pray a tales.
To pray that the number of jurymen may be completed. It sometimes
happens that jurymen are challenged, or that less than twelve are in
the court. When this is the case the jury can request that their
complement be made up from persons in the court. Those who supplement
the jury are called talesmen,
and their names are set down in a
book called a talesbook
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894