D'Arcy Power, Dictionary of National Biography… (1893)
“ In the early stages of a disease so insidious as cancer there are always sufficient grounds to base diametrically opposite views of the cause producing the patient's symptoms. In the case of the emperor, of Germany, Mackenzie chose to take the more hopeful view, stating at the time of his first visit to Berlin that it was impossible to decide on the nature of the disease. The English physician doubtless found on reaching the German court that he was the object of some jealousy, and this feeling was rapidly intensified by the aggressive manner which he assumed in self-defence. ”
