Acquisitions and Acquisitions et Biblographic Services services bibliographiques

This manuscript has been reproduced from the microfilm master. UMI films the text direcüy from the original or copy subrnitted. Thus, some thesis and dissertation copies are in typewriter face, mi le others may be from any type of cornputer pn'nter. The quality of this reproduction is hpenâent upon the qurlity of the copy subm-d. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard rnargins, and impmper alignment can adversely affect reproduction. In the unlikely event that the author did not send UMI a complete manuscript and ttiere are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate aie deletion. Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand corner and continuing from left to right in equai secüons with small overlaps. Photographs induded in the original manuscript have been reproduœd xemgmphically in this copy. Higher quality 6 " x 9 " biadc and white photogmphic prints are available for any photographs or ilustrations appearing in this copy for an additional charge. Contact UMI directly to order