In Garve's original review there were 312 lines—Feder left only 76 lines unchanged. He made minor changes in 69 lines and extensive changes in the rest. Feder added a new element to the review by comparing Kant with Berkeley and Hume. But this comparison was in line with Garve’s intention in the original review because Garve’s characterization of Kant’s idealism was not different from what Feder proposed in his revisions.
Kant was not satisfied with the review. He took the charge that he is an idealist like Hume and Berkeley (which is Garve’s key charge against him) very seriously. He bitterly complained that Garve had not understood him, and decided to write a detailed response, which became a new book, Prolegomena to Any Future Metaphysics (1783).
In the Prolegomena, Kant summarizes and explains the key arguments of the Critique. In the book’s appendix he offers his rebuttal of Garve’s review.
In August 1783, a journal published a short piece on the Prolegomena and called special attention to Kant’s charge that Garve had not understood him. Garve responded with an article in which he said: “If the honorable and witty man [Kant] did not live so much in the clouds, if he did not use a terminology of his own and if his sentences were shorter and simpler, he might be less exposed to this danger [of being misunderstood].”
Later on the original version of Garve’s review of the Critique was published in another journal, but Kant was still dissatisfied with it.