The rarity of hair-ball coincident in the stomach and in the intestine has led me to report the following case, which also has an unusual symptomatology: History. —The patient, H. C. A., aged 13, the daughter of a physician, with the exception of the usual diseases of childhood and a pneumonia at the age of 11, had always been in good health. When about 2 years of age she developed the habit of sucking her right thumb and at the same time twisting and pulling her hair with the left hand. At the age of 5, she was first noticed by her parents actually to put hair in her mouth and swallow it. This was observed occasionally in her up to her tenth year, but since that time it was thought that the habit had been discontinued and forgotten. She had always eaten heartily and digestion had been apparently normal