Full Idea
In English, the word 'evidence' behaves as a mass term: we speak of someone's having little evidence for an assertion, and of one thinker's having more evidence than another for a claim. One the other hand, we also speak of 'pieces' of evidence.
Gist of Idea
In English 'evidence' is a mass term, qualified by 'little' and 'more'
Source
Ian Rumfitt (The Boundary Stones of Thought [2015], 5.2)
Book Reference
Rumfitt,Ian: 'The Boundary Stones of Thought' [OUP 2015], p.133
A Reaction
And having 'more' evidence does not mean having a larger number of pieces of evidence, so it really is like an accumulated mass.