In my communication re “Percain Spinal Anæsthesia” appearing in the British Journal of Anæsthesia for January, I notice a serious printer's error. On page 66 is stated: “Spinal headache occurred with varying degrees of severity in the first 100 (sic) cases.” This of course is absurd, as the notes were based on 80 cases only. The number should be 10 (ten).