This is a brief note intended to report recent measurements of CCl3F and CCl2F2 in stratisoheric samples obtained in 1973 through 1975. The samples were collected by a balloon-borne cryogenic sampling system which has been described previously (Lueb, Ehhalt, and Heidt, 1975). The method allows us to collect large air samples (10l STP) for the laboratory analysis of a number of trace gases. It has been used since September 1973. Aliquots of the samples had been stored and were analyzed this year for their halo-carbon content by gas chromatography with an electron capture detector. Results of these measurements are compared to calculated predictions.