. . . Kane thought he could distinguish from the wearer’s expression whether he was telling the truth or not. But with animals it’s a completely different ball game. Suppose Rex was out to deceive him. How could he tell? The nag’s muzzle always looked pretty much the same, whether he was pawing the straw in his stable or rubbing his head appreciatively against Kane’s arm after a treat of some sort. Rinty always looked attentive, jaws open, tongue a-pant, with a kind of serious, alert smile, and then his ears would prick up. But who can sound the depth of feeling in an animal’s skull?