Internal conversion cascading in fragments from thermal‐neutron‐induced fission of235U was studied through the measurement of the x rays emitted by the fragments. Two high‐resolution Si(Li) semiconductor detectors were used to measure the x rays which are emitted when internal conversion occurs during the deexcitation of a fragment nucleus. The energies of the two coincident x rays and the kinetic energy of a fission fragment, if present, were recorded event by event as three‐parameter data. The yield of x rays was obtained for the events when two or more x rays were emitted from the same element for the cases of fission and nonfission coincidences and for the events when both fission fragments emitted one or more x rays in coincidence with fission. The yield of x rays from the different elements produced in fission was also measured for single x‐ray fission detections. From the results of the experiment, it was found that the odd‐Zelements of the heavy‐fragment region had a higher proportion of their x rays emitted in multiple‐emission events than did the even‐Zelements. An increase in the single‐x‐ray yield per fragment aboveZ=57 was observed for the even‐Zelements 58 and 60. This rise was not present in the multiple‐x‐ray yields and hence was attributed to the possible enhancement of single low‐energy transitions in the even‐even nuclei of these two elements. It was also observed that, on the average, for a given element split x‐ray emission is anticorrelated; there is a preference for x‐ray emission from one or the other of the two complementary fission fragments.