This study, first published in 1919 then substantially revised in 1947, was based on experiments undertaken by the author into the use of pise de terre and other earth-based materials. It was written at a time when traditional building resources such as brick and timber were in short supply, and there was a need to consider the potential for using alternative materials in construction. Whilst earth building has not developed significantly in the UK, the sustainable architecture movement has helped to stimulate an interest in constructing new earthen buildings. This, coupled with an increasing awareness of the importance of conserving and maintaining our existing stock of earth structures, allows this book to serve as both a historical document and a source of advice and guidance.