1. The object of this investigation is to present the data showing the normal variation of each of the chief constituents of milk from the Fukuoka city market and, in this paper, to determine the seasonal variation of the percentage of fat in 3 samples of the morning's ,whole milk (pasteurized) over a period of one year from May, 1934 to April, 1935. Fat content was determined by GERBER'Sm ethod. 2. The record of seasonal variation of the percentage of fat for each month in 3 samples of milk from the Fukuoka city market shows that the fat content of 2 samples of the milk (No. 1 and No. 3) are the highest in October and the lowest in June, but that of the other sample (No. 2) is the highest in November and the lowest in July differing in that the fat reached a maximum or a minimum a month later than the former samples. These results are similar in general to those found by RICHMOND. 3. The record of seas o nal variation in the percentage of fat in 3 samples of milk from the Fukuoka city market shows that the fat content of 2 samples of the milk (No. 2 and No. 3) is the lowest in the summer (the other sample (No. I) reaching a minimum point in the spring), and all samples gradually rise to the highest point in the autumn and then again decline.
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