I would ask them [the adapters] to make an effort of imagination sufficient to understand the irritation (and on occasion the resentment) of an author, who finds, increasingly as he proceeds, his work treated as it would seem carelessly in general, in places recklessly, and with no evident signs of any appreciation of what it is all about.
[...]
The canons of narrative art in any medium cannot be wholly different; and the failure of poor films is often precisely in exaggeration, and in the intrusion of unwarranted matter owing to not perceiving where the core of the original lies.