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953 prevent repeated rolling on down a hillside, have shown their value time and time again under experimental conditions. Farmers who drive under fruit trees, etc., could have an easily detachable frame fitted. 7. Accidents happen very suddenly. If they are to be avoided individual instruction must be given and the operator encouraged to think ahead. 8. The term " experienced driver " is misleading. A driver of many years' tractordriving experience commonly is expected to master a new tool with the minimum of tuition, a situation not uncommon in the rapidly changing agricultural industry. I submit that the case for safety frames is overwhelming. However, it would appear that powerful action must be taken before farmers make the necessary change of habit.-I am, etc., College Hall. A. K. BACON. Charterhouse Square, London E.C. 1.

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