"No," agreed the Eighth. "I do not believe that there exists in the Universe a mind of sufficient power to break mine. It is a truism that no mental influence, however powerful, can affect a strong, definitely and positively opposed will. For that reason I voted against the use of thought-screens by our agents. Such screens expose them to detection and can be of no real benefit. Physical means were--must have been--used first, and, after physical subjugation, the screens were, of course, useless." * * * * * "I am not sure that I agree with you entirely," the Ninth put in. "We have here cogent evidence that there have been employed mental forces of a type or pattern with which we are entirely unfamiliar. While it is the consensus of opinion that the importance of Helmuth's report should be minimized, it seems to me that we have enough corroborative evidence to indicate that this mentality may be able to operate without material aid. If so, rigid screening should be retained, as offering the only possible safeguard from such force." "Sound in theory, but in practice dubious," the psychologist countered. "If there were any evidence whatever that the screens had done any good I would agree with you. But have they? Screening failed to save Helmuth or his base; and there is nothing to indicate that the screens impeded, even momentarily, the progress of the suppositious Lensman upon Radelix. You speak of 'rigid' screening. The term is meaningless. Perfectly effective screening is impossible. If, as we seem to be doing, we postulate the ability of one mind to control another without physical, bodily contact--or is the idea at all far fetched, considering what I myself have done to the minds of many of our agents?--the Lensman can work through any unshielded mentality whatever to attain his ends. As you know, Helmuth deduced, too late, that it must have been through the mind of a dog that the Lensman invaded Grand Base." "Poppycock!" snorted the Seventh. "Or, if not, we can kill the dogs--or screen their minds, too," he sneered. "Admitted," the psychologist returned, unmoved. "You might conceivably kill all the animals that run and all the birds that fly. You cannot, however, destroy all life in any locality at all extended, clear down to the worms in their burrows and the termites in their hidden retreats; and the mind has not yet existed which is keen enough to draw a line of demarcation and say 'here begins intelligent life.'"