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I’ve been studying the apostrophe and found this in Merriam-Webster’s Guide to Punctuation and Style:

The possessives of proper names are generally formed in the same way as those of common nouns. The possessive of singular proper names is formed by adding -’s.

  • Paris’s cafes

The possessive of plural proper names, and of some singular proper names ending in an s or z sound, is made by adding just an apostrophe.

  • Massachusetts’ capital
  • New Orleans’ annual festival

I find this contradictory. Why do you form the possessive of Paris as Paris’s but the possessive of Massachusetts as Massachusetts’, given that they both end in an s which is not silent? What’s the difference between those?

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Concentrate of speech and sounds instead of on writing and you'll never go wrong. It depends on whether the speaker is thinking that the noun is plural or not whether they add an extra "iz" sound to it for the possessive. And different speakers think of this differently. For the general rule, see the answer to this question. – tchrist Aug 9 '13 at 18:48
There's a post somewhere that's closely related. Will post a link if I find it first. – Kris Aug 12 '13 at 8:27
up vote 7 down vote accepted

The style ruling you cite is not entirely consistent with regard to Massachusetts', New Orleans', and Paris's. That's not to say that it's wrong, but it does seem to be arbitrary—and it is by no means universally accepted by other publishing style guides.

For instance, here is a different guideline from Words Into Type, Third Edition (1974):

Proper names. The possessive form of almost all proper names is formed by adding apostrophe and s to a singular or apostrophe alone to a plural. [Examples:] Jack's, Burns's, Dickens's, James's, Marx's, Adams's, the Davises', Schultz's, Schultzes'

Whenever the apostrophe and s would make the word difficult to pronounce, as when a sibilant occurs before the last syllable, the apostrophe may be used alone. [Examples:] Moses' laws, Isis' temple, Xerxes' army, Jesus' followers

By convention, ancient classical names ending in s add only the apostrophe to form the possessive. [Examples:] Mars' wrath, Achilles' heel, Hercules' labors

Because the last syllable of Massachusetts contains another sibilant besides the final s, the WIT guideline would render its possessive as Massachusetts'; WIT also agrees with the Merriam-Webster guideline on Paris's (assuming that we're talking about the French city and not the Trojan Helen-napper). But the WIT rule would seem to endorse using New Orleans's as the possessive of New Orleans.

The Chicago Manual of Style, Fifteenth Edition (2003) likewise has a lengthy, detailed, and ultimately arbitrary set of guidelines on this point:

7.18 Proper names, letters, and numbers. The general rule [to add an apostrophe and an s to indicate a possessive noun] covers most proper nouns, including names ending in s, x, or z, in both their singular and plural forms, as well as letters and numbers. [Examples:] Kansas's legislature, Chicago's lakefront, Burns's poems, Marx's theories, Berlioz's works...

7.20 Names like "Euripides." The possessive is formed without an additional s for a name of two or more syllables that ends in an eez sound. [Examples: Euripides' tragedies, the Ganges' source, Xerxes' armies

7.21 Words and names ending in unpronounced "s." To avoid an awkward appearance, an apostrophe without an s may be used for the possessive of singular words and names ending in an unpronounced s. Opt for this practice only if you are comfortable with it and are certain that the s is indeed unpronounced. [Examples: Descartes' three dreams, the marquis' mother, ... Albert Camus' novels (the s is unpronounced) but Raoul Cumus's anthology (the s is pronounced)

In the Chicago system, the possessive forms of the three words that Merriam-Webster's uses as examples would be Massachusetts's, Paris's, and New Orleans's. I should note, however, that after delineating its system in great detail, Chicago blandly says "Those uncomfortable with the rules, exceptions, and options outlined above may prefer the system, formerly more common, of simply omitting the possessive s on all words ending in s." That would yield Massachusetts', Paris', and New Orleans'.

The Associated Press Stylebook and Libel Manual (2002) adopts the system that Chicago mentions at the end of its coverage:

SINGULAR PROPER NAMES ENDING IN S: Use only an apostrophe: Achilles' heel, Agnes' book, Ceres' rites, Descartes' theology, Dickens' novels, Euripides' dramas, Hercules' labors, Jesus' life, Jules' seat, Kansas' schools, Moses' laws, Socrates' life, Tennessee Williams' plays, Xerxes' armies.

For sheer consistency, you can't beat AP's guideline. Chicago and Words Into Type provide generally consistent guidelines and try to spell out rules for recognizing exceptions to the general rule. Merriam-Webster's Guide to Punctuation and Style doesn't identify the basis for exceptions to the general rule represented by "Paris's cafes"; it simply observes that "The possessive of ... some singular proper names ending in an s or z sound, is made by adding just an apostrophe." So should you write the possessive of Kansas as Kansas's or Kansas'? The MWGPS guidelines don't say, whereas the guidelines provided by WIT and Chicago do—though they lead to different conclusions.

I don't know how Merriam-Webster's Guide to Punctuation and Style came up with the advice it offers on Paris's, Massachusetts', and New Orleans', but the book doesn't seem to provide much predictive guidance for forming possessives of other proper names ending in s.

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I love the pseudorules stipulating that (a) The possessives of proper names are formed in the same way as those of common nouns. The possessive of singular proper names is formed by adding -’s. (b) Ancient classical names ending in s add only the apostrophe to form the possessive. Hence, Though Athens' foundation was thousands of years ago, Athens's economic future is uncertain. – Edwin Ashworth Aug 9 '13 at 22:10

Why do you form the possessive of Paris as Paris’s but the possessive of Massachusetts as Massachusetts’, given that they both end in an s which is not silent? What’s the difference between those?

The rule for the possessive form of proper name is actually "follow the authoritative source's guidance." The preference for the entity being named over-rides the general rule, esp. when said entity has a publishing organ.

However, it's worth noting that Paris is not only pronounced "pear is", but "pear ri" as well. (My French is atrophied, but I believe the second is actually the preferred pronunciation.) So, you could entirely correctly pronounce Paris's as "pear ri's", rather than the relatively clumsy "pear is es"

No such alternative pronunciation applies to the commonwealth of Massachusetts. (Which, being derived from a language foreign to the European alphabet, was likely spelled phonetically by those who named it.)

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I'm not sure that the French pronunciation of Paris would be applicable unless you're also going to follow the French form of the possessive (whatever that may be!). – TrevorD Aug 9 '13 at 23:16
@TrevorD, since French doesn’t have a possessive case/clitic, but rather circumlocutes it, it would end up being “the cafes of Paris”. I agree, though, that the French pronunciation is irrelevant to how the genitive is marked in English orthography. The s is always pronounced in English, except in the phrase gay Paris. And if you are talking about Paris, Texas, then the s is always pronounced. – Janus Bahs Jacquet Aug 10 '13 at 2:07
@JanusBahsJacquet Thanks. altho' couldn't remember how French does possessive (which is why I wrote "the French form of the possessive (whatever that may be!)", but I suspected it was "X de Y". But, yes, my point was that it's irrelevant to forming the English possessive. – TrevorD Aug 10 '13 at 12:27

The apostrophe is used for human possession as in e.g. Jack's café. However when referring to Paris Cafés we should create a compound noun that reads Paris cafés, an abbreviated version of the cafés of Paris. Similarly in correct English if I can dare to be prescriptive, we should say the capital of Massachusetts rather than Massachusetts' capital because we are not speaking about possession in the human sense. Many languages have the same form for both constructions but not English and it is probably the most abused and misunderstood part of the language - an indication of failure to teach the correct form even to native speakers.

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Teaching a rule to native speakers that they consistently break usually means that your rule is invalid. Until someone explains to me what is wrong with last year's results, I will chuck your rule in the same bin where I store the “split infinitive” and “don't end a sentence with a preposition” fallacies. – oerkelens Sep 11 '14 at 6:44

protected by tchrist Sep 11 '14 at 12:31

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