1920

  1. The relations existing between the soil and its water content: A Résumé of the Subject
  2. Weedkiller usage in England and Wales - information form surveys of farm practice
  3. Weeds of farm land
  4. Field experiments on the chemotropic responses of insects
  5. The fertilizing value of sewage sludges
  6. On the relations between growth and the environmental conditions of temperature and bright sunshine