When we joined them, I found little difficulty in explaining the purpose and working of most parts of the apparatus.

The nature and generation of the apergic power I took care not to explain.

The existence of such a repulsive force was the point on which the Regent professed incredulity; as it was, of course, the critical fact on which my whole narrative turned--on which its truth or falsehood depended.

I resolved ere the close of the inspection to give him clear practical evidence on this score.

In the meantime, listening without answer to his expressions of doubt, I followed him round the interior, explaining to him and to Eveena the use and structure of the thermometer, barycrite, and other instruments.