Does anyone have pointers on changing the font of an Edwin session?

I'm trying to use a bigger font with an Edwin session under Mac XQuartz
xsession.  I read that M-x set-font RET then hit TAB, shows the fonts,
however when I invoke this command I only see -adobe-courier*.  xfontsel
lists many more fonts than this.  I also read that these functions are
supposed to change the font:

((ref-command set-font) "9x15")
((ref-command set-frame-size) 163 90)

however results in "unbound variable: set-font" output.

I'm using MIT Scheme 9.1.1.

Thank you,

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