There are some questions concerning the interpretation of the second peak in the atomic distribution curve of liquid oxygen published by Sharrah and Gingrich. An attempt to determine ozone content in liquid oxygen exposed to X-rays was made, but the amount sufficient to make appreciable contributions to the X-ray diffraction intensity was not detected. From this result, Gingrich\u27s interpretation that this peak originates from ozone, the amount being increased during the X-ray irradiation on liquid oxygen, was denied. Possibilities of the explanation of this second peak and the like peaks in the distribution curves of liquid nitrogen and liquid chlorine are suggested
