Acquisitions et

Abstract

This rnanusaipt has been repmduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, oome thesis and dissertation copies are in typewriter face, mile othen may ba from any type of cornputer pfintsr. Tb quality of this nproduction ir dependant upan the qwlity of the copy submitted. Broken or indistinct print, cobred or poor quality illustrations and photographs. print bhdthwh, substandarâ margins, and improper alignment can advenely affect reproduction. In the unlikely event that the author did not send UMI s complete manuscript and there are missing pages, these will be noted. Also, if unauthofized copyright material had to be removed, a note will indicate the deletion. Ovenue materials (e.g., maps, dmvings. charts) ara reproduced by secüoning the original, beginning at the upper lefthand corner and continiing hom left to nght in equal sections mth small overfaps. Photographs uiduded in the original manuscript have been reproduced xerographically in this copy. Higher quality 6 " x 9 " black and white photographie pnnts are avaiiable for any photographs or illusbations appearing in mis capy for an additional charge. Contact UMI directly to order