The value of a 1899 copy of Uncle Tom's Cabin published by H M Caldwell Company will depend on certain factors, such as the condition of the book. That will be important in determining its value. Also as it was a best selling book with many copies bought, there may be a large number available. How rare the book is is another factor in determining the worth. It could bring as much as $300.00, then again it may be less depending on how preserved the book is.