therein

täten puhekieltä in that; in him/her/it
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. — George Washington
1883, (w), (w) s:The Merry Adventures of Robin Hood/Chapter V|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?"