Avoid beginning words with capitals as much as possible; but use them in the following and similar cases:
Act, when referring to Act of Parliament or Acts of a play; also in Baptist, Christian, Nonconformist, Presbyterian, Puritan, Liberal, Conservative, and all denominational terms and names of parties.
His Majesty, Her Royal Highness, &c.
The King of England, the Prince of Wales.
The Duke of Wellington, Bishop of Oxford, Sir Roger Tichborne, &c.
British Army, German Navy.
Christmas Day, Lady Day, &c.
Dark Ages, Middle Ages.
House of Commons, Parliament, &c.
Government, Cabinet, Speaker.
In geography: Sun, Earth, Equator, the Continent.
In geological names: Upper Greensand, London Clay, Tertiary, Lias, &c.
In names of streets, roads, &c., as—Chandos Street, Trafalgar Square, Kingston Road, Addison’s Walk, Norreys Avenue.
Figure, Number, Plate (Fig., No., Pl.), should each begin with a capital, whether contracted or not, unless special instructions are given to the contrary.
Pronouns referring to the Deity should begin with capitals—He, Him, His, Me, Mine, My, Thee, Thine, Thou; but print—who, whom, and whose.
Also capitalize the less common adjectives derived from proper names; e.g. Homeric, Platonic.