1Thomas Jefferson to Joseph Echols, 23 May 1822 (Jefferson Papers)
I recieve here your favor of the 20 th expressing your desire to enlarge your stock of knolege, than which nothing can be more commendable; but I should not think your purpose of attending an Instructor at all necessary. we have now such excellent elementary books in every branch of science as to make the subjects every subject as plain as a teacher can make it. in Natural philosophy we have...