"Fossil Ice Crystals: A Practical Application of 'Pure Science'" is a fascinating book by scientist Johann August Udden. The author investigates the uniqueness of ice crystals that have been preserved from ancient periods of our planet. In his book, he talks about the importance of pure science in the study of such natural phenomena. Thanks to the detailed descriptions of the illustrations and scientific data, the reader will have the opportunity to better understand the uniqueness and importance of these ancient ice crystals."