We shall not attempt to give a definition of space our idea of it must be considered a primary conception.

Time is defined by the metaphysician as the suc cession of ideas; the physicist treats time, like space, as a primary conception.

Equal times are generally defined as those intervals during which the earth turns through equal angles rela tive to the fixed stars, and any duration of time may then be measured by the angle turned through by the earth during the interval. The most Obvious unit of time is therefore the sidereal day, or the period during which the earth makes a complete rotation on its axis relative to the fixed stars. The unit generally adopted is the second of mean solar time.

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