Instinct perfected is a faculty of using and even constructing organized instruments; intelligence perfected is the faculty of making and using unorganized instruments.
Some other faculty than the intellect is necessary for the apprehension of reality.
Intelligence is the faculty of making artificial objects, especially tools to make tools.
In short, intelligence, considered in what seems to be its original feature, is the faculty of manufacturing artificial objects, especially tools to make tools, and of indefinitely urging the manufacture.