While Visiting Her Uncle,Jackson Remarked That She Admired Her Uncle's

While visiting her uncle,Jackson remarked that she admired her uncle's collection of rare books.Her uncle then said to her,"I've been meaning to tell you that I want you to have them.Instead of leaving them to you in my will,I'm going to give them to you right now.You can consider the books yours.However,please keep them here on my shelves so that my library looks full." Would a court hold that Jackson owns the books? Explain.