This edition uses Dewey's reformed spelling for English. His changes to spelling get more and more "reformed" from the early editions until his death. After that, the editors went back to standard (or as Dewey would say, wasteful) spelling. His explanation of the reformed spelling includes these 5 reasons (excerpted from this volume):

1. Disgrace of having what experts agree is the most illojical, unsyentific, unskolarly and altogether worst speling of any languaj in the world.
   
2. Criminal waste of mony. Careful count of many English selections shows that 15% or 1/7 of the letrs wud by saved by strictly syentific speling.
   
3. Criminal waste of skool time.
   
4. Adling brains. Any student of child skykolojy knows that one cut hardly devize a more dedning process to a normal brain than to teach such words a bone, done, gone; love move, rove; lose, close; or worst of all, Though the rough cough and hiccouph plough me through i ought to cross the lough.
   
5. English as a world language.Except for its scandalusly complex speling, English is betr fitted than any other languaj for universal use. it is practically grammarless.