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STATEMENT BY AUTHORThis thesis has been submitted in partial fulfillment of requirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library.Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made. Requests for permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major department or the Dean of the Graduate College when in his or her judgment the proposed use of the material is in the interests of scholarship. In all other instances, however, permission must be obtained from the author Age had no effect on sucrose preference thresholds.Consumatory activity in all monkeys increased monotonically with increasing sucrose concentrations, from 0.0 to 1.0 M. However, aged monkeys continued to increase consumption until sucrose concentrations exceeded 1.5 M. All monkeys increased consumption by increasing number of Licks, number of licking bursts and length of licking bursts.Compared to young monkeys, aged monkeys displayed gr...