Your agent in Lyon, Gerhard Mann, will presently be able to tell you more concerning this, but here it is in a nutshell: The French government needs to transfer silver to England to pay the French and Irish troops who will invade that country from around Cherbourg in late May. They were going to ship the silver over directly, but recently I have convinced them that it will be more efficient to make use of the existing commercial channels, viz. a Bill issued in Lyon against the credit of M. Castan (backed, it goes without saying, by France) and payable in silver coin in London. The Bill would need to be issued early in May and payable in late May or early June, and it would have to be transferable, since the identity of the French payee in London might not be known until later, and in any case, for obvious reasons, would need to be kept secret.