He had had such books put into his hands by acquaintances, some of whom were of the impressionable hysteric order, but many of whom were as analytically minded as himself.

He found much of such literature in the book shops.

He began to look over the best written and ended by reading them with deep attention.

He was amazed to discover that for many years profoundly scientific men had been seriously investigating and experimenting with mysteries unexplainable by the accepted laws of material science.

They had discussed, argued and written grave books upon them.