Later, Bormenthal begs the Professor for permission to dose Sharikov with arsenic, calling him a man with "the heart of a dog". The Professor is horrified and orders Bormenthal not to "slander the dog". He explains that the human body parts, which came from a drunk, are responsible for all of Sharikov's defects. Bormenthal then suggests that they redo the operation, using the body of a genius. Again the Professor refuses, explaining that the operation was meant to improve the human race. Breaking with his former beliefs, the Professor admits that any peasant woman could give birth to a genius and that eugenics are a waste of time. In conclusion, the Professor refuses to permit Sharikov's murder or to undo the operation, which could easily kill him as well.