Edwin Eckel’s exceptionally detailed volume, published in 1928, presents a wealth of information drawing on his own research as well as the work of all the eminent international authorities in the field of lime mortars and cements. It captures the fascinating development of building materials from the nineteenth century through the first quarter of the twentieth century. Of particular interest is the way in which it chronicles the demise of hydraulic cement, followed by the brief meteoric rise in popularity of natural cements, then subsequently their rapid eclipse by Portland cement. This book will be an invaluable resource not only to everyone involved in conservation of traditional buildings but also those concerned with the early modern buildings constructed from Portland cement. The detailed contents and new introductions by Paul Livesey (UK) and William G. Hime (US) can be viewed on the website.