Quote 1
In his chamber the doctor sat up in his high bed. He had on his dressing gown of red watered silk that had come from Paris, a little tight over the chest now if it was buttoned. On his lap was a silver tray with a silver chocolate pot and a tiny cup of eggshell china, so delicate that it looked silly when he lifted it with his big hand, lifted it with the tips of thumb and forefinger and spread the other three fingers wide to get them out of the way. His eyes rested in puffy little hammocks of flesh and his mouth drooped with discontent. He was growing very stout, and his voice was hoarse with the fat that pressed on his throat. Beside him on a table was a small Oriental gong and a bowl of cigarettes. The furnishings of the room were heavy and dark and gloomy. The pictures were religious, even the large tinted photograph of his dead wife, who, if Masses willed and paid for out of her own estate could do it, was in Heaven. The doctor had once for a short time been a part of the great world and his whole subsequent life was memory and longing for France. "That," he said, "was civilized living" – by which he meant that on a small income he had been able to keep a mistress and eat in restaurants. He poured his second cup of chocolate and crumbled a sweet biscuit in his fingers. The servant from the gate came to the open door and stood waiting to be noticed. (1.37)
The doctor is a shameless exaggeration, a symbol of obsession with wealth.
Quote 2
"Hold the light," the doctor said, and when the servant held the lantern high, the doctor looked for a moment at the wound on the baby's shoulder. He was thoughtful for a moment and then he rolled back the baby's eyelid and looked at the eyeball. He nodded his head while Coyotito struggled against him.
"It is as I thought," he said. "The poison has gone inward and it will strike soon. Come look!" He held the eyelid down. "See– it is blue." And Kino, looking anxiously, saw that indeed it was a little blue. And he didn't know whether or not it was always a little blue. But the trap was set. He couldn't take the chance. (3.40 – 3.41)
The doctor takes advantage of his position of power over Kino. In this novel, it seems as though power has a positive correlation with evil.