you are engaged in an inquiry which I think the most important—which can occupy the human mind next to the first Philosophy— I wish I could attend you to the end of your Career but as age forbids it—I can only furnish you with such feeble helps as were the productions of former years I have sent you the first Volume of the “the Defence & which I again pray you to return—as I cannot replace it—

please to accept the second Volume as a present for that I have duplicates—

I am Sir your Obliged humble Servant—