Abstract
1. 1. The relative water requirements of three species of Peromyscus, P. floridanus, P. gossypinus and in two population of P. polionotus, were measured by (a) changes in the body weight, (b) the time until death of animals depreived of water and (c) the amount consumed. 2. 2. The results of the studies of tolerance to water deprivation show that these Peromyscus are dehydrated in the field. 3. 3. The basal rates of metabolism were also determined. The results indicate that these rates for the three species are equal to or greater than that which is expected for their body weight. 4. 4. Desert mice can better control their rate of water turnover than the Florida mice. 5. 5. It is argued that the reduction water exchange is proportional to a decrease in metabolic rate.
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