brevity in Tables 2 and 8 is explained in Table l. ‘able II contains the information obtained from the standard sain recordings and Table 3 lists the photon intensities found from the hishn sain (4x) recordings. Because of the increase in resolving power some lines which were unanalyzable or undetectable on the standard gain records became analyzable on tne nich sain records. The data have been left in tabular form to make the information more readily accessible to those who wish to use it. BRROAS In actual practice tne analysis is more difficult than Might be assumed from tne description in the Analysis of Data section for tne following reasons: (1) The snape of the Compton distribution is known only approximately for a given enersy even though its area is known fairly accurately. were accurately known, #Even if the snape it would be mechanically diffi- cult to draw such a distribution in with a predetermined area. For tnis reason a straight line is use3 for the Compton distribution, with the resulting rectansle having the proper area. It is found, however, after drawing in this rectangular representation of the Compton distribu- tion several times and getting the "feel" of the machine, that the base line for eacn succeeding peak estimated with similar can be accuracy 21 .