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formla there is already a stronig tendency to reaction, and the cat.alyt simlv)ly increases this tendencyl . Oni account of the t-oo great readiness w\N-ith w-hich the gruaiacuiin iunl(lerw-enit the oxidationi chanae ,ivimn the characteristic blineilg, anild ;also onl accouiit of thle fact tbat blood, ain(l othler oxi(lizing bo(lies not fermernts, realdil y-ielded thle guiaiacum test, other more definite tests w'ere souglht out. A considerable iuinumber of tests lhave beeni (lescribed in wlichdoi:10.1042/bj0040136 fatcat:jtzrykgkrbhcdkju4jd2rjheve