The purpose of this thesis is to elucidate the primary structure of the B chain of Asian elephant, Elephas maximus, hemoglobin. This hemoglobin was chosen for investigation because it provides the specific model necessary for testing the following: 1. The direct comparison of the amino acid sequence of the B chain of elephant hemoglobin with other known sequences may explain the high oxygen affinity of this hemoglobin (2). 2. Elephant hemoglobin sequence studies may also clarify the tenuous taxonomic relationship which exists at present between the two living elephant species (3). 3. The relationship of this species to other animals may be extended by comparisons of known sequences.