1. The inquiring liveliness of Captain’s ears and the freedom with which Mr. Sigsbee employs verbal directions when the horse is tired and inattentive suggests the possibility that this animal may receive auditory cues that are given involuntarily by his master. It is not only conceivable but even likely that Captain is sensitive to changes in his master’s respiratory sounds. A spasmodic inspiration, a faint sigh or a sudden quickening of respiration might easily serve as cues for Captain. One need only translate Rendlich’s and Pfungst’s explanation of Hans’ behavior from visual into auditory terms to arrive at a fairly satisfying guess as to how it is possible for Captain to perform his wonderful feats. 2. My observations, although incomplete and inconclusive in many respects, have convinced me that Captain can give correct answers in entire independence of directive visual stimuli. There was no trickery about his blindfold: Captain wore a leather mask which so well excluded the light that he had to be led from place to place on the stage. Even when he was not blindfolded, and seemed to be keen to understand and to obey them correctly, he attended only with his ears. 3. I am convinced that Mr. Sigsbee is sincere in his belief that Captain is capable of abstract thought, and that he resorts to no trickery in his public performances. It is also gratifying to know that he is of the hard-headed type to whom a scientifically established explanation would be acceptable, even though it might run counter to his own presuppositions. If it proves to be the case that his horse is accessible to stimuli to which human ears are obtuse, and that master as well as public has been literally “taken in” by horse-cleverness the humorous aspect of the situation will appeal to him. From a purely commercial standpoint he need have no fear as to the “show” value of a horse which can beat a crafty old trainer at his own game by training the master to give such exquisitely delicate cues that the master himself is not aware of giving them. It is not surprising that Mr. Sigsbee had to fall back upon telepathic explanations. CAPTAIN’S PRAYER OF THANKSGIVING