I would like to thank my committee members Harlan Miller, James Klagge, and William Fitzpatrick for all their help with this thesis. I must especially express my gratitude to Drs. Miller and Klagge for the promptness with which they were willing to read my material, and to my advisor Dr. Fitzpatrick for all his patient advice and comments. Thanks also are due to the entire Virginia Tech philosophy faculty and to the graduate students, from whom I could always expect a helpful conversation when needed, a pleasant diversion when desired, and most importantly, someone nearly forcing me to get some work done when such coercion was not desired, but certainly needed. Especially helpful in this regard was Jesse Ehnert, with whom I had many conversations that were somehow simultaneously helpful and pleasantly divergent.