8. Assuming all the above theories to be insufficient, we now come to:
The Elements of a Scientific Explanation
In studying this subject we must remember certain things:
(a) That telepathy is a highly complex phenomenon, and for that reason we must not expect to find its solution easily or state it in a single sentence.
(b) That we must consider it from the double standpoint, physical and mental; and
(c) That we must consider the conditions affecting the operator, the subject, and, if possible, the connection between them.
All scientific explanation consists in reducing the unknown to terms of the known. We can often classify a phenomenon without being able to explain its innermost nature. If we discover its laws, we have advanced to that extent.
Dr. J. Ochorowicz, who has made a prolonged and minute study of this question, writes as follows regarding the necessary conditions to be observed in the operator:
"On the side of the operator the conditions have been very little studied. But it is probable:
"1. That there are personal differences.