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It is , then , with good reason that of all that remains , when we exclude primary substances , we concede to species and genera alone the name ' secondary substance ' , for these alone of all the predicates convey a knowledge of primary substance . Quantities consist either of parts which bear a relative position each to each , or of parts which do not . For my last evening in Death Valley I heed a Van Valkenburg tip and head into the sand dunes under a full moon . The lively bustle in the streets had been a torture that she could not bear . And then I started reading about the isolated Huichol of Mexico 's Sierra Madre Occidental , with their complex relationship to peyote , and I found a people who claim access to higher forms of knowledge that Euro-centric societies can hardly fathom . All you need to change is what you claim the product does . Thus , some quantities consist of parts which have position , and some of those which have not . For if he does not know definitely that than which it is more beautiful , he can no longer claim to know definitely that it is more beautiful than something else which is less beautiful : for it might be that nothing was less beautiful . In short , where there is no sort of combination of words , truth and falsity have no place , and all the opposites we have mentioned so far consist of simple words . I walk a mile or so up and down 60 - and 70-foot [ 18 - and 21-meter ] rises until I claim a perfect skybox under the heavenly klieg light .