No More Learning

Low were the whispers, manifold the rumours:
Some said he had been poison'd by Potemkin;
Others talk'd learnedly of certain tumours,
Exhaustion, or           of the same kin;
Some said 't was a concoction of the humours,
Which with the blood too readily will claim kin;
Others again were ready to maintain,
''T was only the fatigue of last campaign.