what did robert koch do?
Physician
contradiction
 In front of around 60 students , Bayliss stimulated the nerves with electricity for half an hour , but was unable to demonstrate his point . The dog was then handed to a student , Henry Dale , a future Nobel laureate , who removed the dog 's pancreas , then killed him with a knife through the heart . This became a point of embarrassment during the libel trial , when Bayliss 's laboratory assistant , Charles Scuttle , testified that the dog had been killed with chloroform or the ACE mixture . After Scuttle 's testimony Dale told the court that he had , in fact , used a knife . 

contradiction
 Bob 's intelligence serves him in many ways . During the episode " Cape Feare " , for example , the parole board asks Bob why he has a tattoo that says " Die , Bart , Die " . Bob replies that it is German for " The , Bart , The " ; members of the board are impressed by his reasoning . Believing that " nobody who speaks German could be an evil man " , they release him . However , his love of high culture is sometimes used against him . In the same episode , Bob agrees to perform the operetta H.M.S. Pinafore in its entirety as a last request for Bart. The tactic stalls Bob long enough for the police to arrest him . 

contradiction
 Bob 's intelligence serves him in many ways . During this episode , for example , the parole board asks Bob why he has a tattoo that says " Die Bart , Die " . Bob replies that it is German for " The Bart , The " . The board members are impressed and release him because " no one who speaks German could be an evil man " ( an allusion to Adolf Hitler ) . However , his love of high culture is sometimes used against him . In the same episode , Bob agrees to perform the operetta H.M.S. Pinafore in its entirety as a last request for Bart. The tactic stalls Bob long enough for the police to arrest him . 

contradiction
 The book also loosely explores the dangers of anger , and actions taken in anger . It is only Sir Thursday 's loss of control and subsequent murder of two Piper 's Children that allows Arthur to gain control of the Fourth Key , assisted by Thursday 's Dawn , Noon and Dusk . 

contradiction
 The journal of John Crawfurd records another method of execution by elephant in the kingdom of Cochinchina ( modern south Vietnam ) , where he served as a British envoy in 1821 . Crawfurd recalls an event where " the criminal is tied to a stake , and [ Excellency 's favourite ] elephant runs down upon him and crushes him to death . " 
