The procedure that the experts followed in wet cupping was as follows. First, the cups were immersed in hot water. Bayfield recommended that one glass be used for every four ounces of blood required. Thus, to abstract 18 to 20 ounces, as was common in cupping on the back or abdomen, four or five glasses were needed. The spot chosen for placement of the cups should be free of bone, but also not overly fatty. Cupping over the belly of a muscle was especially recommended. After the spot was fomented with hot water, the torch was dipped in alcohol, lit, and inserted into the cup for about two seconds. Once the torch was removed, the cup was allowed to sink of its own weight into the skin. During the minute that the skin was allowed to tumefy under the cup, the scarificator was warmed in the palm of the hand in preparation for the most difficult part of the operation. It required great skill to manage torch, scarificator, and cups in such a way as to lift the cup, scarify, and recup before the tumefaction had subsided. Monson Hills (1834) described the manipulations involved thus:
The torch is held in and across the palm of the right hand, by the little and ring finger, leaving the thumb, the fore and middle fingers free to hold the scarificator, which may be done by the thumb and fore finger only; the glass is then grasped by the thumb, fore and middle fingers of the left hand, leaving the little and ring fingers free; the edge of the glass is then detached from the skin by the middle finger of the right hand; the scarificator being set, care must be taken not to press upon the button with the thumb too quickly; directly the glass comes off, we apply the scarificator, spring it through the integuments, and then placing it between the free little and ring fingers of the left hand, we apply the torch to the glass, and glass to the skin over the incisions, as before recommended.[123]
Hills recommended practicing on a table, "taking care, of course, that the lancets are not allowed to strike the table."
According to Bayfield, the blades of the scarificator were generally set at 1/4". If cupping behind the ears, they should be set at 1/7", if on the temple at 1/8", and if on the scalp at 1/6". When the cups were two-thirds full, they were removed and reapplied if necessary. This, too, was no easy task. One had to manipulate cup and sponge deftly in order to avoid spillage. Cupping was to be not merely a neat operation, but an elegant one. After cupping, the wound was dabbed with alcohol or dressed, if necessary. Scarificator blades could be used some twenty times. After each use, the scarificator was to be cleaned and greased by springing it through a piece of mutton fat.[124]