acid, which is a quinoline-carboxylic acid, C_{9}H_{6}N(COOH),
cinchomeronic acid, which has just been stated to be a pyridine
dicarboxylic acid, and a pyridine tricarboxylic acid. When cinchonine is
treated with potassium hydrate, it is decomposed into quinoline and a
solid body, which on further treatment yields a liquid base,
C_{7}H_{9}N, which is probably lutidine. It has been found, moreover,
that both tetrahydroquinoline and dihydroquinoline, hydrogen addition
products of quinoline, are present. When cinchonine is distilled with
solid potassium hydrate, it yields pyrrol and bases of both the pyridine
and quinoline series.

_Cinchonidine_, when heated with potassium hydrate, yields quinoline
also, and with nitric acid the same products as cinchonine.

_Strychnine_ has been found to be a tertiary amine. When distilled with
potassium hydrate, quinoline is formed.

_Brucine_ is a tertiary diamine, that is, formed by substitution in a
double ammonia molecule. When distilled with potassium hydrate it yields
quinoline, lutidine, and two isomeric collidines.

The alkaloid _atropine_ has been quite thoroughly studied with results
of great interest. When heated with baryta-water or hydrochloric acid,
it takes up a molecule of water and is split into tropine,
C_{8}H_{15}NO, and tropic acid, C_{9}H_{10}O_{3}. This latter is
phenyl-oxypropionic acid. Tropine, when heated to 180°C. with
concentrated hydrochloric acid, splits off a molecule of water, and
yields tropidine, C_{8}H_{13}N, a liquid base, with an odor resembling
conine. When this tropidine is heated with an excess of bromine, it
yields dibrompyridine.