I read a sentence in "Word Power Made Easy" which was:
Believe me the old saw that claims you cannot teach an old dog new tricks is a baseless, if popular, superstition.
Does the "if popular" part mean that the superstition is baseless "only if" it is popular or does it mean that superstition is baseless "even if" it is popular? Don't you think the right word should have been written before "if" by the author?