In chapter 1 when Kino and Juana take Coyotito to the doctor.
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The doctor was of a race which dominated Kino's race,
"This doctor was not of his people. This doctor
was of a race which for nearly four hundred years had beaten and
starved and robbed and despised Kino's race, and frightened it too, so
that the indigene came humbly to the door,,,"
The doctor hence considered Kino with contempt and superiority. Kino really had nothing to compel the doctor to help his child.