Items

• February 20, 1940
• June 24, 1937
• June 11, 1937
• June 3, 1937 (afternoon)
• May 20, 1937
• May 6, 1937
• April 26, 1937
• March 25, 1937
• March 17, 1937
• March 16, 1937: Colour and light
• March 16, 1937 (afternoon)
• June 8, 1936: Lessons to teachers: Lesson XVIII