Synthesized answer
The author provides evidence of his experiences among the desperately poor and destitute in London and Paris [Passage 1]. He painstakingly documents a world of unrelenting drudgery and squalor, including sleeping in bug-infested hostels and doss houses, and working as a dishwasher in a vile hotel [Passage 1]. He also describes living alongside tramps and surviving on scraps and cigarette butts [Passage 1].
The passages do not specify the exact nature or extent of the evidence beyond these descriptive accounts of his experiences.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Down and Out in Paris and London by George Orwell Description: 'You have talked so often of going to the dogs – and well, here are the dogs, and you have reached them.' George Orwell's vivid memoir of his time among the desperately poor and destitute in London and Paris is a moving tour of the underworld of society. Here he painstakingly documents a world of unrelenting drudgery and squalor – sleeping in bug-infested hostels and doss houses, working as a dishwasher in the vile 'Hotel X', living alongside tramps, surviving on scraps and cigarette butts – in an unforgettable account of…