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The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photoQ~aphs, prii It bleedthrough, substandard margins, and improper alignment can adversely affeet reproduction. ln 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, drawings, charts) are reproduced by sectioning the original, beginning at the upper left•hand corner and continuing tram left to right in equal sections with small overlaps. Each original is also photographed in one exposure and is included in reduced form at the back of the book.Photographs included in the original manuseript have been reproducedxerographically in this copy. Higher quality 6" x gn black and white photographie prints are available for any photographs or illustrations appearing in this copy for an addilional charge. Contact UMI directly to arder.

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