Did Agricola see or carefully consider everything he wrote about?
No
Yes
Some things but not others
He made up his results
Answer
The answer is yes. Agricola was the governor of Roman Britain and he wrote a book about the people and places of Britain. He spent a lot of time traveling around the country and talking to people, so he was very familiar with the subject.
Unearthing the Legacy: Test Your Knowledge on Georgius Agricola, the Father of Mineralogy