The analysis of Ricardo's first monetary writings, during the bullion controversy, leads to some conceptual critiques about the money of account. Analytically, between the notes (means of payment) and the standard metal, there is no space in these papers for the unit of account. Merged both with means of payment (coins and notes) carrying it and with the (gold) standard supposed to define it, it disappears from the conceptual field. This paper tries to find the unit of account in analysing writings that would forget its scientific interest. It shows that the ricardian approach comes up against the problem of the monetary reality of a society where we count, we express prices and contracts in a name (the pound) that transcends payment forms ...