They called in, at the last moment, Desault, a great doctor of that day.

But Desault was, unfortunately, honest.

He went home and told his assistant that this was not the Dauphin, and that, whoever he might be, he was being poisoned.

The assistant's name was Choppart, and this Choppart made up a medicine, on Desault's prescription, which was an antidote to poison." Monsieur de Gemosac paused, and, turning to his companion, held up one finger to command his full attention.
"Desault died, my friend, four days later, and Choppart died five days after him, and the boy in the Temple died three days after Choppart.
And no one knows what they died of.

They were pretty bunglers, those gentlemen of the Republic! Of course, they called in others in a hurry; men better suited to their purpose.