The reason too is very simple: it is only at Full Moon that _Tycho_ reveals himself in all his splendor.

The shadows therefore vanishing, the perspective foreshortenings disappear and the views become little better than a dead blank.

This is the more to be regretted as this wonderful region is well worthy of being represented with the greatest possible photographic accuracy.

It is a vast agglomeration of holes, craters, ring formations, a complicated intersection of crests--in short, a distracting volcanic network flung over the blistered soil.

The ebullitions of the central eruption still evidently preserve their original form.