This useful pamphlet has been prepared by several Australian physicists and is distributed by the government to those working with radium. It contains a clear summary of the most important phases of our knowledge of the physics of radium, of the methods of placing radium and radon in the containers, size and construction of these containers, tables of the decay of radon, a discussion of the advantages and disadvantages of radon as compared to radium, and of the conditions governing the issuance of government radium to hospitals, approved medical practitioners and research workers. The Australian Department of Health owns 10 Gm. of radium and the report suggests that where radium is to be distributed it is best used in the form of radon. No instructions are given for the clinical application of these two forms of radiation.