The first of these is the pyridine series, including pyridine, C{5}H{5}N, picoline (methyl-pyridine), C{5}H{4}N(CH{3}), lutidine (dimethyl-pyridine), C{5}H{5}N(CH{3}){2}, and collidine (trimethyl-pyridine), C{5}H{2}N(CH{3}){3}.

Morphine, rapidly distilled over zinc dust, yields phenanthren, trimethyl-amine, pyrrol, pyridine, quinoline, and other bases.