different between therfore vs therein

English

therfore (not comparable)

there +? in

therein (not comparable)

(takes a reflexive pronoun) in that; in that place; in him/her/it.
- September 1792, George Washington, letter
  My observation is that whenever one person is found adequate to the discharge of a duty... it is worse executed by two persons, and scarcely done at all if three or more are employed therein.
- 1883, Howard Pyle, The Merry Adventures of Robin Hood Chapter V
  "Ha," said Robin, "comest thou from Locksley Town? Well do I know that fair place for miles about, and well do I know each hedgerow and gentle pebbly stream, and even all the bright little fishes therein, for there I was born and bred. Now, where goest thou with thy meat, my fair friend?"

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