We want, as it were, a special "Time Microscope," which I have already referred to, to examine these vibrations, and a method similar to that already mentioned in "Space," under Celestial Photography, by which we may traverse and examine hundreds or thousands of octaves by each second of exposure; for, although the path extends to infinity, we have already arrived at the utmost limits of our finite senses, and find that after all we can only appreciate fifty-one octaves, a few inches only, as it were, along the line of Infinite extent, reaching from the finite up to the Reality; and even so it must be borne in mind that we have only travelled in one direction, whereas the path we have taken extends in the opposite direction also to infinity. We started with sixteen vibrations in a second, as the lowest number of beats we human beings can appreciate as a musical sound; let us now descend by octaves. The octave below is eight vibrations in a second, and there are probably many animals that can only hear these as a musical sound; the next octave is four, then two, and then one vibration in a second. But we do not stop there; the octave below this is one vibration in two seconds, then in four seconds, eight seconds, sixteen seconds, and so on, until it is possible to conceive that even one frequency in a million years might be appreciated as a musical sound, or even as one of the colours of the spectrum, by a being whose time sensations were enormously extended in both directions, but still finite. Once more we must call a halt. Our finite minds become bewildered in attempting even to glance at these infinities of time. We measure space by miles, yards, feet, and inches; we measure time by years, hours, minutes, and seconds; and by these finite units we try to fathom these two marvellous infinities. With our greatest efforts of thought we find, however, that we can get relatively no distance whatever from the HERE of Space and the NOW of Time. It is true that the present, as a mathematical point, appears to be hurrying and bearing us with it along the line stretching from the past to future eternity, but in reality we get no further from the one nor nearer to the other. Let us change our view and examine this subject under a different aspect.