27 OCTOBER 1967, Page 36

Rough weather

Sir: I wouldn't want SPECTATOR readers to think me even more innumerate than I am. In convert- ing Centigrade to Fahrenheit, or vice versa, the first stage is add forty and the third stage is to subtract forty. The figure thirty-two belongs to a different conversion formula and owes its appear- ance in last week's 'Consuming Interest' column to a gremlin and not to