In the 18th and 19th centuries, trade, shipbuilding and seafaring on the island developed more intensely. In 1771, Alberto Fortis visited Cres and Lošinj (which was then called Osero) and wrote a travelogue about his visit: "Saggio d'osservazioni sopra l'isola di Cherso ed Osero." After the fall of the Republic of Venice in 1797, Lošinj became part of the Austrian province (crown land) of Istria under the Treaty of Campo Formio. By 1900 the population had reached 11,615. In 1921, it was given as 15,000.