place their money with the Bank often receiving a small rate of interest on it. A number of borrowers receive loans of a large part of these deposited funds at somewhat higher rates of interest. But the Banker has always to keep enough cash or easily realisable securities to meet any probable demand by the depositors. No doubt there will generally be loans to persons of undoubted solvency which can quickly be called in, but it may be very undesirable to use this second line of defence. If as in the present case some of the securities of the Bank are realised in order to meet withdrawals by depositors, it seems to their Lordships to be quite clear that this is a Civil Appeal No.3291­3294 of 2009, etc. Page 37 of 45normal step in carrying on the Banking business, or, in other words, that it is an act done in “what is truly the carrying on” of the Banking business. This, it appears to their Lordships, is the more appropriate and satisfactory ground for dealing with the question arising