“ ‘A Russian nobleman who is now resident in England,’ it runs, ‘would be glad to avail himself of the professional assistance of Dr. Percy Trevelyan. He has been for some years a victim to cataleptic attacks, on which, as is well known, Dr. Trevelyan is an authority. He proposes to call at about quarter past six tomorrow evening, if Dr. Trevelyan will make it convenient to be at home.’

“This letter interested me deeply, because the chief difficulty in the study of catalepsy is the rareness of the disease. You may believe, then, that I was in my consulting-room when, at the appointed hour, the page showed in the patient.