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403 tion of the blades, unless the head be very low down in the pelvis. Here the curved or so-called long forceps can be sometimes used when the straight ones are inapplicable; but in any case the perineum is much in the way. When the forceps have been applied the further steps to be gone through vary according to circumstances. Sometimes we extract with the head in the same position ; at other times we rotate the head through a quarter of a circle-reduce the position, in fact, from third todoi:10.1016/s0140-6736(02)60215-6 fatcat:wttmpeilfzgrvbcn3425m6egxi