JSTOR is a component of ITHAKA, a not-for-profit Firm encouraging the tutorial Group use digital technologies to maintain the scholarly document and also to advance analysis and teaching in sustainable means.P?ruv??n C????n? is ?n? ?file th? ?ur??t f?rm? of C????n? that ?? file?und ?n th? ?l?n?t. It is u??d b? ????l? ?? ?t?mul?nt t? ?n?r???? th? ?r