Questions on the use of lesser have appeared on here before, but I was reading a book on grammar which states the following (I omitted parts to keep it brief, but I retained what I think are the important parts):
"Adjectives which gave a comparative or superlative signification do not admit the addition of ... the terminations, er, est ... the following examples break this rule:"
It then lists examples. Here is the one I am confused by: "From these various causes, which in greater or lesser degree, affected every individual in the colony, the indignation of the people became general."
The book sets "lesser" in italics, suggesting this is in error, yet my search on-line doesn't seem to yield any issue with the use of lesser. I found questions discussing the use of less versus the use of lesser, with it being argued that lesser is used for 'quality'. Here, I assume that 'less' is more appropriate.
My questions are as follows:
Should 'less' replace 'lesser' in the phrase "greater or lesser degree"?
Is the book claiming that 'lesser' is not a word?