No abstract

This manuscript has been r^rodaced from the microfilm master. UMI films the text directfy from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of cong)uter printer.The quality of this reproduction is d^iendait upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and in^oper alignment can adversefy a&ct 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 win indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from lefr to right in equal sections with smaH overlaps. Rich original is also photographed in one exposure and is included in reduced form at the back of the book.Photogr^hs inckided in the original manuscr^ have been reproduced xerographicalty in this copy. Hi^er quality 6" x 9" black and white photographic prints are available for sag photographs or illustrations appearing in this copy for an additional charge. Contact UMI directly to order.

This manuscript has been r^rodaced from the microfilm master. UMI films the text directfy from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of cong)uter printer.The quality of this reproduction is d^iendait upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and in^oper alignment can adversefy a&ct 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 win indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from lefr to right in equal sections with smaH overlaps. Rich original is also photographed in one exposure and is included in reduced form at the back of the book.Photogr^hs inckided in the original manuscr^ have been reproduced xerographicalty in this copy. Hi^er quality 6" x 9" black and white photographic prints are available for sag photographs or illustrations appearing in this copy for an additional charge. Contact UMI directly to order.