Mars, the Milky Way, the Pleiades.
20. Ordinal numbers used to designate numbered political divisions, sessions of Congress, names of regiments, Egyptian dynasties, and the like.
Second Congressional District,
First Ward, Ninth Precinct, Forty-third
Congress, Sixth Massachusetts Regiment,
Fifth Dynasty.
21. Names of genera but not of species: except that in botanical and zoölogical copy the species may be capitalized if derived from a proper name.
Agaricus campestris
Parkinsonia Torreyana
Pterygomatopus schmidti, (Medical).
The English derivatives from these scientific words are not capitalized. We write of the agarics, the felids, the carnivores, etc.
22. Father, mother, and other words denoting relationship when used with a proper name or without a personal pronoun.
I saw Aunt Lucy and Cousin Charles.
I saw my aunt Lucy and my cousin Charles.
I have received a letter from my mother.
I have received a letter from Mother.
23. Names of political parties and of philosophical, literary, and artistic schools, and their adherents.
Republican, National Liberal, Social Democrats, Stoics (but neo-Platonism, pseudo-Christianity, etc.) the Lake school, the Romantic movement, the Symbolic school of painters.