In this manner, the experiment was continued with frequent changes in the character of the diet, but always maintaining essentially the same values in nitrogen and calories as shown in the table, until June 27; having extended through just eleven months, with the animal at the close of the experiment still gaining in body-weight, with a steady plus balance of nitrogen, and with every indication of good health and strength. For ten months the animal lived with perfect comfort and in good condition on an average daily intake of 0.26 gram of nitrogen per kilogram of body-weight, and with an average fuel value of 70.3 calories per kilo. Further, it is to be observed that at no time during the ten months did the daily intake of nitrogen rise above 0.28 gram per kilo, while during one month it fell to 0.23 gram per kilo. Similarly, the fuel value of the daily food never exceeded 73 calories per kilo, while at times it dropped as low as 67 and 65 calories per kilo. That this diet was more than sufficient, both in nitrogen and fuel value, is indicated by the steady increase in body-weight and by the plus nitrogen balances observed in most of the periods throughout the experiment. Indeed, with the comparatively low degree of muscular activity which this animal was accustomed to, it would have been unwise to have kept the subject much longer on a diet so rich as the above, since there would have been danger of detriment to its health and good condition. When these results are contrasted with the statements of Munk and Rosenheim, the latter of whom found that even 0.32 gram of nitrogen and 110 calories per kilo were insufficient to maintain dogs in a condition of health, it is plain that for some reason our results are quite at variance with their findings. The accompanying photographs, taken on August 19, 1905, February 27, April 24, and at the close of the experiment on June 27, 1906, show the appearance of the animal at the respective dates, and indicate more clearly than words can express the actual condition of the animal. [Illustration: _Subject No. 5._ _August 19, 1905_] [Illustration: _Subject No. 5._ _November 18, 1905_] [Illustration: _Subject No. 5._ _April 24, 1906_] [Illustration: _Subject No. 5._ _June 27, 1906_]