FTP, name this philosophical treatise by John Locke.
This work claims that sensation is always of a quality and that qualities are either primary-extension, figure, mobility, and number; or secondary-not really belonging to things but imputed to them.  It goes on to argue that knowledge, at once general and real, must be of the relation of ideas to each other, though that point is more doubtful in The Reasonableness of Christianity, a follow up to this work.  Its motif appears in the beginning, a refutation of the doctrine of "innate ideas," maintaining that all knowledge is of empiric origin.  FTP, name this philosophical treatise by John Locke.
This work claims that sensation is always of a quality and that qualities are either primary-extension, figure, mobility, and number; or secondary-not really belonging to things but imputed to them.  
Essay concerning Human Understanding