Otis Adelbert Kline 
The Call of the Savage 

Raised in a lab (alongside a chimp) by a brilliant, but misguided scientist, a young boy is trained to be a killing machine. But the young boy, Jan, is clever enough to escape from the lab and make it out into the surrounding swamp with his chimp mentor at his side.

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Otis Adelbert Kline (July 1, 1891 – October 24, 1946) born in Chicago, Illinois, was a songwriter, an adventure novelist and literary agent during the pulp era. Much of his work first appeared in the magazine Weird Tales. Kline was an amateur orientalist and a student of Arabic, like his friend and sometime collaborator, E. Hoffmann Price.