Abstract IT HAS been a common observation by the writer for several years in his work of visiting hatcheries in the course of inspection that early in the season the hatcheries located in southern Ohio received much better hatches than those located in northern Ohio. Just how much this difference was had not been determined, and to what extent it existed was not known. So in order to get some definite idea as to what this difference might be and to secure any other information that the records might show the hatchability records by weeks was secured from a total of 37 hatcheries scattered over Ohio for the spring of 1935. Table 1 gives the average hatchability of all reporting by weeks together with the location of the hatcheries in the various sections of the State which had the highest and lowest hatches each week. The averages were by hatcheries and . . .