The rapid excretion by the kidneys is one of the cardinal conditions of safety, and also necessitates the very frequent administration of the drug.
A similar condition obtains in the steamengine, in which a great rate of working necessitates the dissipation of a large amount of energy.
In these circumstances, when, as frequently will be the case, the person calling desires to be put in communication with a subscriber who belongs to another section, connexions must be established in the office between the two sections; this necessitates additional switchboard arrangements, and also increases the time required to put subscribers in communication with one another.
The specialization which accompanies the division of labour has important geographical consequences, for it necessitates communi 1 On the influence of land on people see Shaler, Nature and Man in America (New York and London, 1892); and Ellen C. Semple's American History and its Geographic Conditions (Boston, 3903).
The ordinary revenue of the empire is in excess of the ordinary expenditure, but the extraordinary expenditure not only swallows up this surplus, but necessitates the raising of fresh F loans every year.