Table 11 shows the amounts of water and food consumed by two females of each species while they were either in the later stages of pregnancy, or were nursing. Although the data in Table 11 do not cover the full developmental time of the litters involved, it is obvious that both lactating females of _P. truei_ and one female of _P. maniculatus_ consumed more water than the average for their species (Table 7). Water and food consumption was measured for both females of _P. truei_ while they were nursing. The female that gave birth to litter A was left in the cage with the male for several days after the litter was born, resulting in another litter being born about 27 days after the first. Therefore, the record of this female represents an extreme case of stress (probably a common occurrence in nature) in which a female is nursing one litter while she is pregnant with a second. The record of the female of _P. truei_ that gave birth to litter B is the most complete, including data from the fifth day after parturition until the young were weaned on the thirty-third day after parturition. The record of the female of _P. maniculatus_ that gave birth to litter C covers the last 10 days of nursing before the young were weaned. After being separated from her litter, this female drank more than the average amounts of water, on both high and low protein diets. Although the food and water were lost several times for the female of _P. maniculatus_ with litter D, the period of time covered by the 14 days when water and food consumption were measured includes times just prior to parturition and to weaning of the young. TABLE 11--Water and Food Consumed by Nursing Females of _P. truei_ and _P. maniculatus_. Consumption Is Calculated on the Basis of Amount (Milliliters or Grams) Consumed per Gram of Body Weight per Day, as well as Total Amounts Used per Day. Column headings: A: Water used B: No. days C: Average weight D: ml. H_{2}O/gm./day E: Total water/day F: No. in litter G: Food used H: gms. food/gm./day I: Total food/day