1. When several nouns follow one another, all being in the same case.
2. When several adjectives follow one another, all modifying the same noun.
3. When a succession of phrases modifies the same noun.
This kind of succession is called a series. Each new member gives a new idea, the comma being used to help the reader to separate one from the next with ease. Notice that the comma is used between the last two members before the coördinate conjunction as well as between the other members.
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Dear Sir:[4]
You can make no mistake in buying BCL Power Co. bonds now the company supplies power to mines and towns of Colorado Utah and Idaho it furnishes electric light and power to Ophir Ouray Ames Pandora and other towns in Colorado in Utah it supplies light to Mescal Eureka Provo Logan and Bingham it also furnishes power for the street railway systems of Salt Lake City Farmington and Ogden.
The bonds offer such good security good interest and ready convertibility that we expect our allotment to be heavily oversubscribed will you therefore send us your order before Monday
Yours truly,
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