The Reverend James Wood, writing in the Nuttall Encyclopaedia in 1907, said that such a tune when played in foreign lands, produces on a Swiss an almost irrepressible yearning for home, repeating 18th century accounts the mal du Suisse or nostalgia diagnosed in Swiss mercenaries. Singing of Kuhreihen was forbidden to Swiss mercenaries because they led to nostalgia to the point of desertion, illness or death. The 1767 Dictionnaire de Musique by Jean-Jacques Rousseau claims that Swiss mercenaries were threatened with severe punishment to prevent them from singing their Swiss songs. The Romantic connection of nostalgia, the Kuhreihen and the Swiss Alps was a significant factor in the enthusiasm for Switzerland, the development of early tourism in Switzerland and Alpinism that took hold of the European cultural elite in the 19th century.