His collection of some 15,000 books was considered to be the most valuable mathematical library in England and was bequeathed to George Parker, the second earl of Macclesfield.
Kanyang koleksyon ng ilang mga 15,000 mga libro ay itinuturing na ang pinaka-mahalagang matematiko library sa Inglatera at noon ay bequeathed sa George Parker, ang pangalawang erl ng Macclesfield.