This classic study examines and explains a branch of statistical method widely used in connection with insecticides, fungicides, drugs, vitamins, etc.

List of examples; Foreword; Preface; 1. Introductory; 2. Quantal responses and the dosage-response curve; 3. The estimation of the median effective dose; 4. The maximum likelihood solution; 5. The comparison of effectiveness; 6. Adjustments for natural mortality; 7. Factorial experiments; 8. The toxic action of mixtures of poison; 9. Miscellaneous problems; 10. Graded responses; Appendix 1. The computing of probit analyses; Appendix 2. Mathematical basis of the probit method; References; Tables; Index of authors; Index of subjects.