of the most careful X-ray operators in the city. If this suit
goes against you, one of the most brilliant men of science in
America will be ruined. Now, having said this much, let me ask
you to describe just exactly what treatments you gave Mrs.
Close."

The doctor led us into his X-ray room adjoining. A number of
X-ray tubes were neatly put away in a great glass case, and at
one end of the room was an operating-table with an X-ray
apparatus suspended over it. A glance at the room showed that
Kennedy's praise was not exaggerated.

"How many treatments did you give Mrs. Close?" asked Kennedy.

"Not over a dozen, I should say;" replied Gregory. "I have a
record of them and the dates, which I will give you presently.
Certainly they were not numerous enough or frequent enough to
have caused a dermatitis such as she has. Besides, look here. I
have an apparatus which, for safety to the patient, has few
equals in the country. This big lead-glass bowl, which is placed
over my X-ray tube when in use, cuts off the rays at every point
except exactly where they are needed."

He switched on the electric current, and the apparatus began to
sputter. The pungent odour of ozone from the electric discharge
filled the room. Through the lead-glass bowl I could see the
X-ray tube inside suffused with its peculiar, yellowish-green
light, divided into two hemispheres of different shades. That, I
knew, was the cathode ray, not the X-ray, for the X-ray itself,
which streams outside the tube, is invisible to the human eye.