logit and polytomous data

I am new to generalized linear models and studying 
McCullagh & Nelder (1989). Especially, I have a problem 
resembling the \"cheese taste\" example (5.3.1. p. 109) of 
the book. I tried to analyse the cheese example with R but 
failed to do so because R allowed me to use logit link 
function only with binary family that supposes 0 <= y <= 1. 
Do I need to scale the y\'s or is there another way?

Kari Ruohonen
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