The Call of the Savage (1931) aka Jan of the Jungle

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.
**About the Author
Otis Adelbert Kline was born in Chicago, Illinois on the 1st of July 1891 and died at the age of fifty-five at Short Beach, Connecticut on the 24th of October. During his adulthood, he led a varied career from vanilla extract salesman, to songwriter, to editor, to popular adventure and science fiction author to literary agent. He was also an amateur orientalist and studied Arabic, an interested that strongly influenced his fictional novels and short stories. However, his fame is due to the literary “feud” he had with Edgar Rice Burroughs. Like Burroughs he wrote science fiction romance he placed on Venus, Mars and the Moon and had adventures located in the most remote jungle of Earth. After the mid-thirties, Kline almost entirely abandoned writing to focus on his career as an international literary agent. Among others, he represented Robert Erwin Howard (Conan’s creator) between 1933 and 1936 and, after Howard’s death, he acted as the literary agent of the Howard’s Estate until his own death. He was also the American agent of H.G. Wells.