Summary (The principles of the Analysis of Regression with an application to dosage mortality data).The principles of the analysis of regression are explained to research workers. For advanced statisticians a mathematical treatment is given in the appendix (in English), which follows closely the practical procedure and differs markedly from those given by Kendall or Wilks. The suite of a previous article on dosage mortality data (Statistica1: 257) isgiven by way of exampl