"—some hereditary taint," Conrad was saying. "Old John doubtless fell heir to some ingrown weakness brought on by some loathsome disease, which was his heritage from perhaps a remote ancestor—such things occasionally happen. Or else—well, you know old John himself pried about in the mysterious parts of the earth, and wandered all over the East in his younger days. It is quite possible that he was infected with some obscure malady in his wanderings. There are still many unclassified diseases in Africa and the Orient."