If a bank groups these liabilities together in the balance-sheet, you cannot tell the amount of reserve it ought to keep.

The necessary information is not given you.
Nor can you certainly determine the amount of reserve necessary to be kept against deposits unless you know something as to the nature of these deposits.

If out of 3,000,000 L.of money, one depositor has 1,000,000 L.to his credit, and may draw it out when he pleases, a much larger reserve will be necessary against that liability of 1,000,000 L.than against the remaining 2,000,000 L.The intensity of the liability, so to say, is much greater; and therefore the provision in store must be much greater also.

On the other hand, supposing that this single depositor is one of calculable habits--suppose that it is a public body, the time of whose demands is known, and the time of whose receipts is known also--this single liability requires a less reserve than that of an equal amount of ordinary liabilities.

The danger that it will be called for is much less; and therefore the security taken against it may be much less too.