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When we use the albino rat for experimental purposes we have to know how its normal growth is. But the growth of the albino rat is very responsive to external conditions such as food, housing, temperature, exercise, and incidental disturbances, especially light and noises. The results of obseruations on the growth of the albino rats differ very much according to different workers judging from the data appeared in the literature. The first observations were made by Donaldson, Dunn and Watson ('06) at the University of Chicago. The stock albino rats were fed mainly on milk-soaked bread with corn. Their growth curves are shown by B in the accompanying graphs 1 and 2. Weighing was made on 19 males and 17 females at frequent intervals, so long as the animals had been kept in good condition. King ('15) made two series of observations (1912-1913), (1913-1915) on the growth of the albino rats of the Wistar Institute, fed on the diet composed of selected table scraps prepared there. She used 23 males and 23 females in the first series and 27 males and 27 females in the second, and combined the records of these two series, as shown in C. The best data were recorded by Greenman and Dub ring ('23). They used a group of 148 males and 158 females of the stock animals of the Wistar Institute, which were specially well taken care for and fed. Growth curve represents their results. While I was taking care of the albino rats of Prof. Y a ts u ' s stock

A Record of the Growth of the Albino Rat reared in Japan.