I answered, “It is rested by sleep, but has gone without food long beyond its accustomed time. It can do this while it shares your vitality, but afterwards the need re-asserts itself with increased urgency. It is cold also, and, as you know, it has suffered recent damage, which it needs rest to repair.” She replied, “I can give you strength, if you need it, and if you think it wise; but consider. “We have resolved on an adventure of which we do not know the length or the end. Of myself, I should continue in the ordinary course without food for about four months, after which I should require a time of rest and nourishment, before I should be fit for another year. If necessary, I could continue living, and in some measure of activity, for a much longer period. But I have been giving you of my own energy so freely that, if we continue in this way, I shall be exhausted in a much shorter time. Then I must return to my own place and people, as the food on which you rely--and the Dwellers also--is of no use to me. I ask this,--is it better that we should continue to share the strength I have, or should we find food for your body, and so regulate our movements in future that we can make it self-supporting?” I answered, though my body ached for the vitality on which it had learnt to rely, “I think that it will be wiser for us to conserve the strength you have, which we may need in days to come, when there may be no means of renewal. But it will make important differences, for which there must be allowance in the plans we form. I am used to sleeping at short intervals, because my accustomed day is only about a quarter the length of that which you now have; and even though I obtain regular and suitable food, I shall still be incapable of the rapid and prolonged exertions which I have endured with the stimulus of your hand to help me. “It appears to me that we must commence our enterprise by penetrating one of the tunnels that open on to the opal pavement. It is true that there must be other means of access inland, by which the Dwellers emerge in the daytime, but there are two reasons against attempting to use them. One is that we do not know their location, and though they may be nearer, it is equally possible that they may be more distant. The other is more serious. We are told that the Dwellers come up through the inland passages, and descend by those which are on the lower level. By choosing the latter, and following behind them when the night has fallen, we may reasonably hope that we shall be able to enter their abodes without encountering any who are coming in the opposite direction. In addition to these reasons, it occurs to me that the country inland is of an extremely forbidding and mountainous formation, and though the Dwellers are able to traverse it, it might be absolutely impossible for us to do so.”