Here's one way this chapter could go. After defining the terms 'innate' and 'idea', we say whether Chomsky thinks any ideas are innate -- and if so, which ones. Unfortunately, we don't have any theoretically interesting definitions to offer; and, so far as we know, Chomsky has never said that any ideas are innate. Since saying that would make for a very short chapter, we propose to do something else. Our aim is to locate Chomsky, as he locates himself, in a rationalist tradition where talk of innate ideas has often been used to express the following view: the general character of human thought is due largely to human nature.