Add punctuation: Newton is referring directly to that the black crow black scoria and 2 purgations purifications with potassium nitrate may take 34 purgations will develop a silvershining largely serrated star
Newton is referring directly to that "the black crow" (black scoria) and 2 purgations (purifications) with potassium nitrate (may take 3-4 purgations) will develop a silver-shining largely serrated star.