1. The Essence of Buddhism (Radio Lecture, Colombo, 1933)
2. Kamma & Rebirth (Lecture, Ceylon University, 1947)
3. Paticca-Samuppada: Dependent Origination (Second Lecture under the Dona Alphina Ratnayaka Trust, University College, Colombo, 1938)
4. Mental Culture (Based on a lecture delivered in Tokyo, 1920).