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Dr Scheme Error

I am a newbie just beginning to learn scheme using the Teach Yourself Scheme 
in x days tutorial that can be downloaded with Dr Scheme.  Now I have this
question.  I put Dr Scheme in the "Full Scheme" mode and typed the following
in the lower window:

            (/ 3)  and got 1/3 as expected

then I typed

            (- (/ 3)) and expected to get -1/3; but got -2/3  !!!!

What gives?