VI 
me during their prosecution, but also for the instruction 
and kindness received during the two years that it has 
been my pleasure to be in his laboratory. 
To his former most able assistant Dr. Mayer my 
most sincere thanks are due for the interest he has 
taken in my studies. 
To Professor Kobell, by whom the crystal measu¬ 
rements were verified, I am much indebted for the aid 
rendered me. Finally I may be allowed to express my 
gratitude to Professor Wohler for the assistance afforded 
me in the presenting of this dissertation. 
May, 27 th - 
