How does Conway reach the hospital at Chung-Kiang according to the doctor that treated Conway? (Epilogue)

From the text:

They couldn't exactly remember—after all, it was a long while back—but suddenly, when I was on the point of giving up the cross-examination, one of the nuns remarked quite casually, 'I think the doctor said he was brought here by a woman.' That was all she could tell me, and as the doctor himself had left the mission, there was no confirmation to be had on the spot.

Oh, yes, he said instantly, he remembered the case of the Englishman who had lost his memory. Was it true he had been brought to the mission hospital by a woman? I asked. Oh, yes, certainly, by a woman, a Chinese woman. Did he remember anything about her? Nothing, he answered, except that she had been ill of the fever herself, and had died almost immediately...