The book provides just about all known elements before, many on each side, some of the more important (such as iron or carbon) on double pages. The cartoon illustrations are charming, although the logic of divisions sometimes not quite open up to me (why are beryllium and magnesium a separate category, while boron and thallium are thrown together?) And have crept some really unnecessary mistakes - the beard is intended to reflect when the element was discovered, but the images are suitable in some cases not to the data indicated on the same side; the shape and color of the eyes seem to have any meaning, but the pattern does not open up and will also nowhere explained in the book.
Conclusion: quite rewarding, but you should not take it too seriously.