“There is a second kind of account stated where the account contains items both of credit and debit, and the figures on both sides are adjusted between the parties and a balance struck. This is called by Blackburn J., in Laycock v. Pickles, a ‘real account stated,’ and he describes it as follows: ‘There is a real account stated, called in old law an insimul computassent, that is to say, when several items of claim are brought into account on either side, and, being set against one another, a balance is struck, and the consideration for the payment of the balance is the discharge of the items on each side. It is then the same as if each item was paid and a discharge given for each, and in consideration of that discharge the balance was agreed to be due. It is not necessary, in order to make out a real account stated, that the debts should be debts in praesenti, or that they should be legal debts. I think equitable claims might be brought into account, and I am not certain that a moral obligation is not sufficient. It is to be taken as if the sums had been really paid down on each side; and the balance is recoverable as if money had been really taken in satisfaction; subject to this, that where some of the items are such that, if they had been actually paid, the party paying them would have been able to recover them back as on a failure of consideration, the account stated would be invalidated.”