Why should we capitalize first person pronoun 'I' even if it does not appear in the beginning of a sentence? Why it is not the case for other pronouns?
The pronoun I began to be 'capitalized' around the middle of the 13th century. But this was not true capitalization. Note that it was long before the printing press: all texts were in manuscript.
Before the 11th century, the letter i was normally just a short vertical line, without a dot. The j did not exist as a separate letter. When an i was written as a separate word or mark, as the Roman numeral I and the pronoun I, or when it was the last one of a group of i's, it began to be written elongated, as a j (without the dot). The elongation of the separate, single i was probably done in order to avoid confusion with punctuation marks. That of the last i of a group was mostly in order to avoid confusion between u and ii or between n and ii, which often look identical in manuscripts: from then on, such groups looked like ij and iij (but without the dots).
I believe that this convention of elongating the pronoun I had already been established by the time the dot was first used. Because a long j without a dot looks much like a capital I—which has been written the same way since Antiquity—, it was later assumed to be a capital. (Incidentally, the dot was then usually written as a very short diagonal line above the i or j.)
For reasons of typography. Minuscule "i" just gets lost.
From the article in NY Times:
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protected by RegDwigнt♦ Dec 9 '12 at 15:56
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