For instance, it is customary in all countries for business men to loan large sums of money in bank bills instead of checks.

It is customary for the lender to make no memorandum of the transaction.

It is customary, for the borrower to receive the money without making a memorandum of it, or giving a note or a receipt for it's use--the borrower is not likely to die or forget about it.
It is customary to lend nearly anybody money to start a bank with especially if you have not the money to lend him and have to borrow it for the purpose.

It is customary to carry large sums of money in bank bills about your person or in your trunk.

It is customary to hand a large sure in bank bills to a man you have just been introduced to (if he asks you to do it,) to be conveyed to a distant town and delivered to another party.