§ 1. It occasionally happens that at the time when A telepathically influences B, A on his side has an impression which strongly suggests that B has reciprocally influenced him. The best proof of this is where A expresses in words some piece of knowledge as to B's condition. Other more doubtful cases (of which two are quoted) may be provisionally referred to the same type; but unless A's description includes something which he could not have known or guessed in a normal manner, his alleged percipience of B cannot be assumed to have been more than mere subjective dream or vision . . . 454-458

§ 2. Examples of apparently reciprocal action. They may be regarded as special cases of "telepathic clairvoyance"; A's percipience of B being apparently active rather than passive, and due to some extension of his own faculties, connected with the abnormality of condition that occasions his agency, and not to any special abnormality in B's condition ..... 458-465

The cases which, on the evidence, would be clearly reciprocal, are so few in number as to justify a doubt whether they represent a genuine type. Supposing them to be genuine, however, their rarity is not hard to account for; and it may be hoped that time will bring us more well-attested specimens . . . 465