Sentence:  I am assured that if a man chews it in the manner invented by M. Fletcher of the United States, he can live for an unlimited period on four ounces a day .... We have therefore food for one man for forty days, food for two for twenty days. ... at the end of that twenty days, "one of us will <WSD>Fletcherise</WSD> the other!" 
Meaning of the word marked with <WSD> tags:  To thoroughly chew (dozens or hundreds of times) before swallowing.