"As soon as I perceived these facts I threw about the council room a screen of force entirely impervious to anything longer than ultra-rays. The warning continued, and I then knew that our fears were only too well grounded—that there is in this Galaxy somewhere a race vastly superior to ours in science and that our destruction is a matter of hours, perhaps of minutes."
"Are these ultra-rays, then, of such a dangerous character?" asked the general. "I had supposed them to be of such infinitely high frequency that they could be of no practical use whatever,"
"I have been trying for years to learn something of their nature, but beyond working out a method for their detection and a method of possible analysis that may or may not succeed I can do nothing with them. It is perfectly evident, ho
