because this is an old book it is possible to download it or read it online. for uk and australia (though i can only test from the uk) it is available from
http://onlinebooks.library.upenn.edu...s?id=olbp32167 i don't know if US ppl are not allowed to read it here, or if they are actually blocked. it may be available elsewhere online, but i suspect (since upenn.edu is a US instition, and they say nay) that it is still under copyright there.