Read this: Charles Peirce (1839–1914) was highly influential in laying the groundwork for today's empirical scientific method.[citation needed] Although Peirce severely criticized many elements of Descartes' peculiar brand of rationalism, he did not reject rationalism outright. Indeed, he concurred with the main ideas of rationalism, most importantly the idea that rational concepts can be meaningful and the idea that rational concepts necessarily go beyond the data given by empirical observation. In later years he even emphasized the concept-driven side of the then ongoing debate between strict empiricism and strict rationalism, in part to counterbalance the excesses to which some of his cohorts had taken pragmatism under the "data-driven" strict-empiricist view.

Whose rationalism did Peirce criticize?
What is the answer? (If it cannot be answered, return "unanswerable")
Descartes