29786
I'm looking at this picture of the 日米和親条約 (Kanagawa convention) from the late
Edo period and it seems rather strange:

![enter image description here](https://i.stack.imgur.com/7iwsJ.jpg)

It looks like the non-kanji parts are rather haphazardly written in katakana
and hiragana. For example, the first part: 全権 **ニテユカル** ペレトペルリ **を** . And the
next page, 日本と合衆国と **ハ** 其人民...

Is there some sort of rules behind this, or is it just stylistic choices by
the person in question? It does seem that Japanese orthography wasn't really
standardized until the Meiji period (in which official documents seem to be
written in a weird constrained Classical Japanese with 濁点 omitted, but I'll
ask that as another question), but this random usage of katakana and hiragana,
well I've haven't seen it before. I thought a text usually used either
katakana or hiragana for its non-kanji parts.
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question
history orthography kana classical-japanese handwriting
Haphazard usage of katakana and hiragana for particles and okurigana
The document follows consistent rules, if you look at it more closely.

Firstly, the document itself is actually highly cursive, both in its kanji and
hiragana. After this time and up until 1945, it became standard for treaties
and formal documents to be written exclusively in kanji and katakana. The fact
that this uses hiragana is a result of its cursive style.

But, as we can see, katakana is used to write the foreign name Matthew
Calbraith Perry, as katakana is the only standard script for writing foreign
names, even in the otherwise cursive script of the document.

Some of the characters that look like katakana, such as ハ, are actually
hentaigana, as @marasai points out, referencing [this
list](http://www10.plala.or.jp/koin/koinhentaigana.html). In fact, if you
reference all the documents
[here](http://archive.wul.waseda.ac.jp/kosho/he05/he05_00917/he05_00917.html)
(courtesy of @viven), all of which are cursive, all characters used are
perfectly valid _hentaigana_. Some look like katakana, but are actually
consistently hiragana throughout the document, but are simply historical
variant hiragana that have since become nonstandard. Hiragana was only
standardized in 1900 (this document is from 1854), making these historical
variants understandable.

* * *

[![An extract from おくのほそ道, from the Waseda University
Archives](https://i.stack.imgur.com/JFn7U.jpg)](https://i.stack.imgur.com/JFn7U.jpg)

Note that all the kana are hiragana/hentaigana. We see the hentaigana ハ appear
again on both pages

* * *

As mentioned, the sole exception to this is when writing a foreigner's name,
which has always been standard to write in katakana throughout history, even
in cursive documents.

The document isn't haphazard persay, but rather uses a very cursive style,
meaning that all kanji are cursive, and all kana are hiragana (including
variant hentaigana) _except_ for foreign names. Its style is totally
consistent in this regard, just different to modern Japanese usage,
particularly of hiragana/hentaigana forms.
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answer
Using ハ for particle "wa" was a part of their proper style to write official
documents or letters at that time.

The writing style of 日米和親条約 in your image is [候文]{そうろう・ぶん}, which was a formal
writing style during the Edo period. If you would read other 候文 documents or
letters written in the Edo period, you would notice that ハ is almost always
used for particle "wa" in them, and は is almost never used for it.

For example, the following web page shows a 候文 document which is
[人相書]{にん・そう・がき}(a criminal's description) used in 1746
([延享]{えん・きょう}[三年]{さん・ねん}).

> [古文書解読講座 第１１回 江戸の人相書
> 史料の解読と読み下し例](http://www.soumu.metro.tokyo.jp/01soumu/archives/0703kaidoku11_1.htm#m1)
>
> 【東京都公文書館 / Tokyo Metropolitan Archives】

The handwritten characters in black are of the actual document, and each of
the red characters represents the [楷書]{かい・しょ} of the black character alongside
it. In the bottom part starting with (中略), there are a couple of ハ characters
such as

> [其身]{その・み} **ハ** ,
>
> [私領]{し・りょう} **ハ**.

They are all particle "wa".

You may find ハヽ in the document. ハヽ means ハバ in this case and is read "waba"
which is composed of the okurigana "wa" of 候 and a particle "ba". This
combination is also almost always written ハヽ. はゝ is almost never used for this
kind of "waba" in 候文.

Using ハ for particle "wa" was very common not only in formal documents or
letters, but also in various kinds of writings during the Edo period.

Actually, using ハ for particle "wa" was already common in the [Heian
period](https://en.wikipedia.org/wiki/Heian_period). So we can see them used
in [Emakimono](https://en.wikipedia.org/wiki/Emakimono) such as [Genji
Monogatari Emaki](https://en.wikipedia.org/wiki/Genji_Monogatari_Emaki)
([源氏物語絵巻](http://dl.ndl.go.jp/info:ndljp/pid/2590780)) etc. But this answer
focuses on the usage of ハ in the Edo period, because 日米和親条約 was concluded in
the Edo period.

##

## ハ or は of Preference

Under certain conditions, ハ was replaceable by は or other equivalent kana. The
main conditions were:

  * It's not the first character of a word.
  * It's not a particle.
  * It's not a part of a katakana word (such as a foreigner's name, some kind of exclamation, etc).

These are customary rules. So actually, particle "wa"s written with は exist,
especially in informal writings of the Edo period, but it's very rare.

Here is an example of a replaceable kind of ハ.

The following web page shows the image of the first page of a book called
[怪談御伽童]{かい・だん・お・とぎ・わらわ} published in 1772([明和]{めい・わ}[九年]{く・ねん}).

> [『怪談御伽童 巻一』Image
> 2](http://archive.wul.waseda.ac.jp/kosho/he13/he13_01458/he13_01458_0001/he13_01458_0001_p0002.jpg)
>
>
> 【[書籍概要](http://www.wul.waseda.ac.jp/kotenseki/html/he13/he13_01458/index.html)
> / 早稲田大学図書館 Waseda University Library】

In the right page, there is the title of the book like this.

> [怪談御伽童]{くハひ・だん・を・とぎ・ワらハ}
>
> （I replaced some hentaigana with modern standard hiragana.）

The last character of the furigana([振]{ふ}り[仮名]{がな}) is ハ here. Then, please
look at the last page of the same book.

> [『怪談御伽童 巻一』Image
> 21](http://archive.wul.waseda.ac.jp/kosho/he13/he13_01458/he13_01458_0001/he13_01458_0001_p0021.jpg)

In the right page, the last line is like this.

> 怪談御伽ワらは巻一終

童 is written ワら **ハ** in the first page, but ワら **は** in the last page. (Both
of them are read "warawa.") The ハ and the は are probably written according to
the author's preference. And it seems acceptable for Edo-period readers,
because this kind of ハ／は is found in many books written in the Edo period.

So, replaceable kinds of ハ existed, but a particle wa was not one of them.

##

## Is the ハ Hiragana Or Katakana?

During the Edo period, people commonly used katakana in hiragana writings or
kanji-hiragana writings. They seemed to try to improve readability by using
katakana. Some Japanese words were almost always written in katakana even in
hiragana writings or kanji-hiragana writings.

So it's possible that Edo-period people categorized ハ as katakana but still
used it in hiragana contexts, although it's also possible that ハ used in the
Edo period was thought hiragana and had a similar shape to katakana ハ like the
modern standard hiragana へ and katakana ヘ.

There are some textbooks for children, published in the Edo period, in which ハ
is categorized as katakana. However I've not found reliable sources in which ハ
was categorized as hiragana during the Edo period. So I can't be sure about
this matter, yet.

ハ used in the Heian period seemed to be hiragana because Heian-period people
seemed not to use katakana in hiragana contexts usually. But Edo-period people
commonly used katakana in hiragana contexts, so it's more difficult to discern
their awareness of using katakana ハ or hiragana ハ. I think it's debatable
whether ハ used in the Edo period is katakana or hiragana.

Anyway, the ハ is kana. And today, it's categorized as hentaigana.

If you are interested in how textbooks, published in the Edo period, are like,
here is an example.

> [『大全童子往来百家通』Image
> 20](http://archive.wul.waseda.ac.jp/kosho/bunko30/bunko30_g0254/bunko30_g0254_p0020.jpg)
>
>
> 【[書籍概要](http://www.wul.waseda.ac.jp/kotenseki/html/bunko30/bunko30_g0254/index.html)
> / 早稲田大学図書館 Waseda University Library】

This image shows a part of a textbook for children, published in
1852([嘉永]{か・えい}[五年]{ご・ねん}). On the left page, there is a chart of katakana
which contains ハ. Then, please look at the next page of it.

> [『大全童子往来百家通』Image
> 21](http://archive.wul.waseda.ac.jp/kosho/bunko30/bunko30_g0254/bunko30_g0254_p0021.jpg)

On the right page of the Image 21, there is the [iroha
poem](https://en.wikipedia.org/wiki/Iroha) (いろは[歌]{うた}) written in hiragana,
which contains は. (The iroha poem was commonly used to learn kana.) The first
two lines are like this.

> いろ **は** にほへと
>
> ちりぬるをわか

Then, in the same page, please look at the inside of the box which contains a
mountain landscape. The box also contains the iroha poem written in a proper
practical style using kanji. The first line says

> [色]{いろ} **ハ** [香]{にほ}へど[散]{ちり}ぬるを
>
> （I replaced some hentaigana with modern standard hiragana.）

This teaches that は of いろは should be replaced by ハ when written in a proper
way. This ハ is a particle "wa." I don't know if the author means the ハ is
katakana or a variant of hiragana は, but anyway, he teaches that ハ is the
appropriate character to use for a particle wa.

Edo-period children learned written Japanese with textbooks like this.

Hope that helps.
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answer