THREE:"Oh, I won't admit that," rejoined Gregg, cheerfully, "we must acknowledge that what we saw this afternoon was entirely abnormal. Even when we were talking to him I had a strong feeling come over me that our interrogator was not a normal human being. I don't mean simply his behaviour. His clothes were an odd sort of colour and shape. And did you notice his boots? Curious, dull-looking things. As though they were made out of some kind of metal. And then, the hat and wig?"He appeared to ruminate, still holding a finger against his nose. Then he shot his left arm out with a swift, gymnastic action and laid the flat palm of his hand upon Arthur's shoulder.