 Cope insisted through his will that no graveside service or burial be held ; he had donated his body to science . He issued a final challenge to Marsh at his death : he had his skull donated to science so his brain could be measured , hoping his brain would be larger than that of his adversary ; at the time , brain size was thought to be the true measure of intelligence . Marsh never accepted the challenge , and Cope 's skull is reportedly still preserved at the University of Pennsylvania . His ashes were placed at the institute with those of Leidy , while his bones were extracted and kept in a locked drawer to be studied by anatomy students . 
