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This manuscript has been reproduced fm the microfilm master. UMI films the text directly horn the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer. The quality of this nproduction h dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. Oversize materials (e-g., maps, dnm'ngs, charts) are reproduced by sectioning he original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overlaps. Photographs included in the original manuscript have been reproduced xerographically in this copy. Higher quality 6 ' x 9 " black and white photographic prints are available for any photographs or illus~ons appearing in this copy for an additional charge. Contact UMI directly to order