First published in 1919. Tilden discusses a compilation of chemical discovery and invention to demonstrate the progress of chemistry in the early 20^th century. Divided into 5 sections, chemical laboratories and the work done in them, modern discoveries and theories, modern applications of chemistry, and modern progress in organic chemistry, the author presents an overview of the subject. The final section of the book contains an account of important discoveries which find practical applications and provide new views of the constitution of the world in which we live.