> By the way, "blackjack" started off as a
> _bonus_ to Vingt-et-Un. I don't know if it was an
> actual side bet, but there was a bonus payout if your
> 21 was the result of the ace of spades and either of
> the black jacks.

According to John Scarne "Black Jack" first appeared as a bank game in Evansville, Indiana in 1910 (it was a private game before that). The bonus you mention first appeared in 1912 and was not a side bet. It paid 10:1. This side bet was called "black jack" whereas the game was called "21". And a 21 in your first two cards paid 3:2. How the game came to be referred to by the bonus is probably lost to history.

GJ