Psychologists, seeing that inference is a mental operation, often extemporize a theory of inference to the neglect of logic. But we have a double consciousness of inference.
There seems no good reason why in modern performances the pianoforte should not be used for the purpose; if only accompanists can be trained to acquire the necessary delicacy of touch, and can be made to understand that, if they cannot extemporize the necessary polyphony, and so have to play something definitely written for them, it is not a mass of interesting detail which they are to bring to the public ear.
Early in the 17th century under the twofold influence of the Dutch Church, with which the Scottish clergy were in close connexion, and of James I.'s endeavours to "justle out" a liturgy which gave the liberty of "conceiving" prayers, ministers began in prayer to read less and extemporize more.
He instituted by proclamation of the 19th of April a blockade of the Southern ports, took effective steps to extemporize a navy, convened Congress in special session (on the 4th of July), and asked for legislation and authority to make the war "short, sharp and decisive."
The democratic, or rather theocratic, rights of the spiritual man were for a time relied on to extemporize so much Church government as might be needed till the Master returned.