two enclaves in the Sundgau region where some older inhabitants cannot speak French, and where Alsatian is still used as the mother tongue. A related Alemannic German survives on the opposite bank of the Rhine, in Baden, and especially in Switzerland. However, while French is the major language of the region, the Alsatian dialect of French is heavily influenced by German and other languages such as Yiddish in phonology and vocabulary. This situation has spurred a movement to preserve the Alsatian language, which is perceived as endangered, a situation paralleled in other régions of France, such as Brittany or Occitania. Alsatian is now taught in French high schools. Increasingly, French is the only language used at home and at work, whereas a growing number of people have a good knowledge of standard German as a foreign language learned in school. The constitution of the Fifth Republic states that French alone is the official language of the Republic. However, Alsatian, along with other regional languages, are recognized by the French government in the official list of languages of France. Although the French government signed the European Charter for Regional or Minority Languages in 1992, it never ratified the treaty and therefore no legal basis exists for any of the regional languages in France. However, visitors to Alsace can see indications of renewed political and cultural interest in the language – in Alsatian signs appearing in car-windows and on hoardings, and in new official bilingual street signs in Strasbourg and Mulhouse. A 1999 INSEE survey, included in the 1999 Census, the majority of the population in Alsace speak French as their first language, 39.0% (or 500,000 people) of the population speak Alsatian, 16.2% (or 208,000 people) speak German, 75,200 people speak English (or 5.9%) and 27,600 people speak Italian. The survey counted 548,000 adult speakers of Alsatian in France, making it the second most-spoken regional language in the country (after Occitan). Like all regional languages in France, however, the transmission of Alsatian is on the decline. While 39% of the adult population of Alsace speak Alsatian, only one in four children speak it, and only one in ten children uses it regularly. Architecture The traditional habitat of the Alsatian lowland, like in other regions of Germany and Northern Europe, consists of houses constructed with walls in timber framing and cob and roofing in flat tiles. This type of construction is abundant in