To these six principal departments may now be added that for the management of the new _Post-Office Savings' Banks_. Like the Money-order Office, it occupies a separate building, in St. Paul's Churchyard. The Savings' Bank Department keeps a personal account with every depositor. It acknowledges the receipt of every single deposit, and upon the requisite notice being furnished to the office, it sends out warrants authorizing postmasters to pay withdrawals. Each year the savings' bank-book of each depositor is sent here for examination, and at the same time the interest accruing is calculated and allowed. The correspondence with postmasters and the public on any subject connected with the banks in question is managed entirely by this department. The already-existing machinery of the Post-Office has been freely called into operation, and the business of the new banks has increased the work of almost all the other branches, especially those of the Receiver and Accountant-General's and the Money-order Offices. Through the former all the investments are received, and all remittances to postmasters for the repayment of deposits are made; while the surplus revenue goes from that office direct to that of the Commissioners for the Reduction of the National Debt. Again, and as another instance of our meaning, the Money-order Office is required to undertake the examination of the general savings' bank account of each provincial postmaster. The staff of the Savings' Bank Office in London is not yet complete, nor will it be until the complete effect of the new on the old savings' bank system be seen.[146] At present, it comprises a controller, an assistant-controller, a principal clerk, ten first-class clerks (four of upper and six of lower section), fifteen second-class clerks, with a number of third-class clerks, and six messengers. The branches of minor importance and the miscellaneous officers of the London Establishment, consist of a _Medical Department_, comprising one medical officer, one assistant medical officer, and one messenger. There are, besides, distinct medical officers attached to each of the London districts. The amount required for this service for 1863-4, including medicine (given gratuitously to all officers who are not in receipt of 150_l._ salary), is 1,715_l._ _A House-keeper's Department_, including a housekeeper and sixteen female servants, requiring a yearly payment of 763_l._ Six engineers, ten constables, and six firemen are also constantly employed and paid by the Post-Office. When we add to this gigantic organization no less than 516 letter-receivers in London, who receive from 4_l._ to 90_l._ a-year for partial service, the reader will have a tolerably correct idea of the establishment required to compass the amount of London postal business in the twenty-fourth year of penny postage.[147]