[This recent question](https://japanese.stackexchange.com/questions/4862/1%e3%82%ab%e6%89%80-%e3%81%84%e3%81%a3%e3%81%8b%e3%81%97%e3%82%87-or-%e3%81%84%e3%81%a1%e3%81%8b%e3%81%97%e3%82%87) brought to mind a question of my own.

The Japanese name for the [Twenty-One Demands](http://en.wikipedia.org/wiki/Twenty-One_Demands) made by Japan in 1915 to the Republic of China is romanised on the wikipedia page as 対華二十一ヵ条要求 (*Taika Nijūichikkajō Yōkyū*).

How is the combination 一ヵ条 meant to be pronounced? If the wikipedia page is correct, what explains the gemination between 一 and 条?