Triturations are made from the scales of Rudimentary Thumb- nail of the horse. It acts on skin_causing its thickening, on nails, which become brittle and fall off. Bones esp. tibiae and coccyx_are painful. It is a highly useful remedy in cracked and ulcerated nipples of nursing women, excessively tender, cannot bear touch of clothing. Breasts swollen, sensitive worse descending stairs. Itching in breast, areola reddened. Nipples almost hanging. Warts on forehead and mammae. Psoriasis of tongue.