ALBERT B. PRESCOTT, Ph.D., M.D., F.C.S., 



DlttEOTOa OF TUE CHEMICAL LABOttATORY IN TUB DNIVEJISITY OP MICHIGAN, 



THIS LITTLE WORK 



IS EESPEOTFULLY DEDICATED 



AS A SLIGHT TOKEN OF THE HIGH ESTEEM IN WHICH 



HE IS HELD BY HIS FORMER STUDENTS, 



THE AUTHORS. 



