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<br />STATEMENT BY AUTHOR <br /> <br />This thesis has been submitted in partial fulfillment of re- <br />quirements for an advanced degree at The University of Arizona and is <br />deposited in the University Library to be made available to borrowers <br />under rules of the Library. <br /> <br />Brief quotations from this thesis are allowable without special <br />permission, provided that accurate acknowledgment of source is made. <br />Requests for permission for extended quotation from or reproduction of <br />this manuscript in whole or in part may be granted by the head of the <br />major department or the Dean of the Graduate College when in his judg- <br />ment the proposed use of the material is in the interests of scholar- <br />ship. In all other instances, however, permission must be obtained <br />from the author. <br /> <br />.... <br /> <br />'/ <br /> <br />SIGNED: ~-z;. , S~~~ <br />V- <br /> <br />APPROVAL BY THESIS DIRECTOR <br /> <br />"4 <br /> <br />This thesis has been approved on the date shown below: <br /> <br />~L~~L <br /> <br />Lecturer of Biological Sciences <br /> <br />~ <br /> <br />/4. If7~ <br />Date <br />