In his younger gallivantings about places of ill repute, and his subsequent occasional variations from the straight and narrow path, he had learned much of the curious resources of immorality.

Being a city of five hundred thousand and more at this time, Philadelphia had its nondescript hotels, where one might go, cautiously and fairly protected from observation; and there were houses of a conservative, residential character, where appointments might be made, for a consideration.

And as for safeguards against the production of new life--they were not mysteries to him any longer.

He knew all about them.

Care was the point of caution.