Next, 10 mice of each species were placed on a diet of Purina Hog Chow for a period of four weeks. This chow contains not less than 36 per cent protein and one per cent fat, and about 42 per cent carbohydrate. Both species increased their daily water consumption immediately after being placed on this diet (tables 7 and 11). On the high protein diet, _P. truei_ again consumed much more water than did _P. maniculatus_ (tables 7 and 9). TABLE 7--Food and Water Consumption of _Peromyscus maniculatus_ and _P. truei_ When Fed Diets of Different Protein Content. Food and Water Consumption Are Determined for the Grams, or Milliliters, Consumed per Gram of Body Weight per Day; Daily Totals Are also Given. ==================================================================== _Peromyscus maniculatus rufinus_ ------------+------+---------------+-------+---------------+-------- Diet | | Food | Total | Water | Total per cent | No. | /gram | grams | /gram | water protein | mice | /day ± S. D. | /day | /day ± S. D. | /day ------------+------+---------------+-------+---------------+-------- Lab Chow 23 | 9 | .201 .074 | 4.455 | .262 .183 | 5.751 ------------+------+---------------+-------+---------------+-------- Hog Chow 36 | 10 | .238 .060 | 5.232 | .496 .186 | 10.749 ------------+------+---------------+-------+---------------+-------- Corn 11 | 11 | .149 .044 | 3.144 | .174 .012 | 3.696 ------------+------+---------------+-------+---------------+-------- _Peromyscus truei truei_ ------------+------+---------------+-------+---------------+-------- Diet | | Food | Total | Water | Total per cent | No. | /gram | grams | /gram | water protein | mice | /day ± S. D. | /day | /day ± S. D. | /day ------------+------+---------------+-------+---------------+-------- Lab Chow 23 | 10 | .216 .070 | 6.353 | .373 .119 | 10.880 ------------+------+---------------+-------+---------------+-------- Hog Chow 36 | 10 | .230 .079 | 6.966 | .653 .189 | 19.571 ------------+------+---------------+-------+---------------+-------- Corn 11 | 10 | .158 .010 | 4.318 | .332 .016 | 9.034 ------------+------+---------------+-------+---------------+-------- The tendency of both species to eat more of the hog chow than they ate when fed standard laboratory chow may reflect a higher palatability of the hog chow. Both species consumed similar amounts of food per gram of body weight, on each of the diets (Table 7). The larger _P. truei_ requires more grams of food per day than the smaller _P. maniculatus_, but this slight difference in food consumption probably has no effect on the distribution of these species within Mesa Verde.